As our world becomes increasingly urbanized, cities are often where we come into contact with the natural world—not just in parks and urban nature preserves, but in more familiar places like residential yards. We conducted bird surveys and social surveys in Chicago-area residential landscapes near forest preserves (primarily in middle- and high-income areas) to examine residents' perceptions of the birds that co-inhabit their neighborhoods and the relationship of those perceptions with characteristics of the bird community. We found that residents value many aspects of neighborhood birds, especially those related to aesthetics and birds' place in the ecosystem. Our results indicate that while birds were generally well liked and annoyances were minor, several common and visible urban species, such as the House Sparrow (Passer domesticus), European Starling (Sturnus vulgaris), and Blue Jay (Cyanocitta cristata), may attract attention for their negative qualities, such as their sounds and effects on personal property. The results also indicate that residents' valuations of ecosystem services are linked to their perceptions of bird species richness rather than the actual species richness, and people may perceive only a subset of the birds in their neighborhoods. Although birds provide many important ecosystem services, perhaps one of their most important roles in cities is as a relatable and likable connecting point between city dwellers and the broader environment.
Today's ecologists recognize that humans—both as agents of change and as recipients of environmental benefits—must be explicitly included in our research framework (Daily 1997, Pickett et al. 2001). Human–nature interactions are a two-way relationship (Fuller and Irvine 2010). People affect birds, both intentionally and unintentionally, through management activities at a range of spatial scales, from residential yards (e.g., Lerman and Warren 2011) to fragmented forest landscapes (Marzluff and Ewing 2001). In turn, birds affect people in many important ways, from controlling agricultural pests to inspiring art (Kellermann et al. 2008, Whelan et al. 2015). Human–nature interactions increasingly occur in our cities, because the majority of people now live in urban areas (UNFPA 2011). These interactions between people and nature in urban areas can have important implications for public support of conservation, but we know very little about how urban residents perceive the birds that co-inhabit their neighborhoods.
The “ecosystem services” that birds provide to people have been increasingly investigated over the past decade (Sekercioglu 2006, Whelan et al. 2008). Some ecosystem services provided by birds are relatively straightforward to quantify. For example, when birds' consumption of insects controls pest populations, the resulting benefit may be quantified as an increase in agricultural yield and net profit (e.g., Mols and Visser 2002, Maas et al. 2013). Birds also benefit humans in ways that are more challenging to commodify in economic or biophysical terms, such as through their indirect effects on ecosystem services (e.g., scavenging affects nutrient cycling, which in turn benefits plants) or the spiritual or symbolic value they may hold for people (Wenny et al. 2011).
The ecosystem-services approach is focused on clearly identifying and accounting for the contributions of nature to human health and well-being, with the goal of aiding decision making. There are several ways to quantify the benefits of ecosystem services. The utilitarian approach, which is most prevalent in recent ecosystem-services research, examines the utility that people derive from the actual or potential use of ecosystems and often quantifies that utility with economic valuation methods (Millennium Ecosystem Assessment 2005). However, the utilitarian approach does not fully capture the complexities of human–nature relationships (Kumar and Kumar 2008, Schroeder 2011). Increasingly, researchers have begun to explore ecosystem-services valuation methods that shed light on the values perceived by those who benefit from the services; some of these techniques involve participatory mapping and/or social-preference surveys for ecosystem services (Raymond et al. 2009, Sherrouse et al. 2011, Calvet-Mir et al. 2012, Martín-López et al. 2012). In addition to expanding valuation methods to include nonutilitarian values, researchers have also noted the importance of increased understanding and inclusion of the intangible benefits that ecosystems provide to people (Chan et al. 2012a, Daniel et al. 2012, Milcu et al. 2013). The Millennium Ecosystem Assessment (2005) recognizes the category of “cultural ecosystem services,” which include “the nonmaterial benefits people obtain from ecosystems.” For example, cultural ecosystem services are associated with benefits such as spiritual enrichment, aesthetic experiences, inspiration, and educational value (Millennium Ecosystem Assessment 2005, Chan et al. 2012b). Cultural services are primarily related to human perception and can be broadly conceived as ecosystems' contributions to generating knowledge and supporting human experiences (Satterfield et al. 2013). However, many ecosystem services—not just those in the “cultural” category—may have some nonmaterial or intangible benefits for people (e.g., emotional attachments or sense of identity associated with natural resources; Chan et al. 2012a). Although these types of benefits and experiences can be difficult to quantify, they may be just as important to people, if not more so, than the more tangible services or economic benefits (Chan et al. 2012a).
Although the ecosystem-services framework has been widely applied in more undeveloped natural environments, ecosystem services can occur in urban areas (Windhager et al. 2010, Gómez-Baggethun and Barton 2013). Cities are precisely where ecosystem services, including those in the “cultural” category, are especially relevant because they can enhance the health and quality-of-life of large populations of people. Intriguing studies in urban ecosystems have recently suggested a link between bird richness (either real or perceived) and benefits like psychological well-being and neighborhood satisfaction (Fuller et al. 2007, Luck et al. 2011, Dallimer et al. 2012, Shwartz et al. 2014). Despite their importance, the ecosystem services provided in urban areas remain relatively unexplored, especially those related to urban birds.
A few studies have provided some general insight into urban residents' perceptions of birds and their benefits and annoyances. In France, these perceptions varied with the level of urbanization and the associated bird communities. Most respondents indicated that birds were a source of personal pleasure, yet they also commonly agreed that birds caused disturbances by generating dirt and noise (Clergeau et al. 2001). This ambivalence toward birds was echoed by another study of urban residents in Norway: Although small birds were the most liked among 24 common urban animal species, including domestic dogs and cats, respondents also reported problems with several common birds, including gulls and Rock Pigeons (Columba livia; Bjerke and Ostdahl 2004). The benefits and problems associated with birds could be linked with the concept of ecosystem services and disservices, respectively. Although ecosystem disservices have not been well explored in recent literature, the concept includes components of ecosystems that are perceived as negative for human well-being (Lyttimäki and Sipilä 2009).
Here, we integrate ecological field methods and social surveys to investigate urban residents' perceptions of the birds that co-inhabit their neighborhoods. We focused on 3 primary research questions. First, what aspects of local birds do residents most value, and what aspects do they find most annoying? In particular, we focused on intangible goods or experiences that birds provide, such as cultural services related to spiritual enrichment, aesthetic experiences, and educational value, as well as problems such as damages to personal property or concerns about health and safety. Second, are residents' perceptions of biodiversity related to the actual bird diversity in their neighborhoods? Recent studies in Europe have suggested that urban residents are unaware of the biodiversity around them (Dallimer et al. 2012, Shwartz et al. 2014), which supports the “extinction of experience” hypothesis with regard to city dwellers and their relationships with nature (Pyle 2003, Miller 2005). Third, are residents' perceptions of the benefits and annoyances of birds influenced by the characteristics of local bird communities or by characteristics of the residents themselves? Understanding how and why birds matter to people can open the door to public conversations about conservation and management strategies at both broad and local scales.
Cook County, Illinois, USA, is home to the city of Chicago and >5 million residents. Our study sites were 25 transects in residential neighborhoods across Cook County; each transect began 100 m from the outer edge of a Cook County forest preserve and extended into the neighborhood for 900 m along residential streets. The residential neighborhoods in our study area were dominated by single-family homes, yards, and street trees. Transects were located ≥500 m apart to minimize spatial dependencies. Our study sites were primarily located in middle- to high-income neighborhoods; this sample characteristic was an artifact of selecting sites near forest preserves for a related study (Belaire et al. 2014) and was not an intentional design. We collected data about both bird communities and human residents along each transect.
Bird Surveys in Residential Neighborhoods
We conducted bird surveys during the peak breeding season in the Chicago area, from June 4 to July 6, 2012 (described in Belaire et al. 2014). Point-count locations were designated every 100 m along each transect, where all birds seen and heard within 50 m of the point were recorded during a 5-min point count (Ralph et al. 1993). Each transect was surveyed twice during the breeding season, on clear, calm mornings between sunrise and 1000 hours. Birds observed flying over the point and species with broad-scale daily movement patterns (e.g., hawks) were not included in analyses.
We described the bird communities in residential neighborhoods at 2 complementary spatial scales. First, we estimated species richness near each residential parcel by calculating the total number of species observed at the 4 point-count locations closest to the home (i.e. within ~200 m of each residence). This allowed us to evaluate the bird species richness most likely experienced by a person around his or her home.
Second, we derived a “commonness” index at the transect scale for 10 common and highly visible bird species: American Goldfinch (Spinus tristis), American Robin (Turdus migratorius), Black-capped Chickadee (Poecile atricapillus), Blue Jay, Cedar Waxwing (Bombycilla cedrorum), Common Grackle (Quiscalus quiscula), Downy Woodpecker (Picoides pubescens), European Starling, House Sparrow, and Northern Cardinal (Cardinalis cardinalis). The commonness index is a count of the number of points at which a species was observed on each transect. A bird species was scored as “present” at a point if it was observed during either survey. This metric estimates the likelihood that residents on a particular transect would encounter that species. Thus, a bird's commonness index could range from 0 (not observed at any point) to 10 (observed at all point-count locations) for a transect.
Residents' Perceptions of Birds
We invited residents in all single-family homes within 50 m of each transect to participate in a social survey (n = 1,751). We developed a survey (following the guidelines of Dillman et al. 2009) to collect information from residents about their yards and perceptions of birds in their neighborhood (the full survey is available as Supplemental Material Appendix A). We requested that the survey be completed by 1 adult with some responsibility for decisions about managing the yard. Surveys were distributed, along with a $1 token financial incentive, using the “drop-off/pick-up” method (Steele et al. 2001, Allred and Ross-Davis 2011), during July–September, 2012. A token financial incentive has been demonstrated to increase response rates and decrease bias associated with nonresponse (Groves et al. 2006, Dillman et al. 2009). After surveys were collected, we checked for nonresponse bias by comparing respondents to nonrespondents in 2 ways: grass and canopy cover in yards (using 0.6-m QuickBird imagery) and household income (comparing survey responses to American Community Survey data for block groups, which are the smallest geographic units for which the U.S. Census Bureau publishes sample data). These 2 methods were selected because they allowed us to determine whether the results were influenced by lack of response from some segment of the population (Dillman et al. 2009).
The survey included several questions about residents' perceptions of biodiversity in their neighborhood, including an open-ended question that asked residents to estimate the number of bird species on their block. We did not specify a time interval over which residents should estimate the number of species. We used the phrase “types of birds” instead of “bird species” to minimize confusing terms and gave examples (e.g., “cardinals, robins, grackles, woodpeckers”) to clarify our meaning. When residents entered a range (e.g., 5–10 or 5+; n = 95), we retained their lowest estimate. Lastly, we calculated a measure of each resident's accuracy by subtracting his or her perceived species richness from the observed species richness at the 4 point counts nearest the residence (within ~200 m).
The survey also asked about aspects of neighborhood birds that residents might value or find annoying or problematic. This portion of the survey was adapted from a tested set of questions regarding benefits and annoyances of trees (Sommer et al. 1990, Schroeder and Ruffolo 1996) and is therefore grounded in environmental psychology. The goal of this part of the survey was to gain information about people's perceptions of the birds in their neighborhood. The survey included the statement “I value birds in my neighborhood because…”, which was followed by a list of 11 positive aspects of birds (e.g., “They have pleasant songs”) (Figure 1). Each of the positive statements describes benefits that urban birds may provide in residential neighborhoods; most of the statements reflect nonmaterial benefits that can be linked with cultural ecosystem services (Table 1). Residents were asked to indicate their level of agreement with each statement on a 5-point Likert scale ranging from “strongly disagree” to “strongly agree.” The survey also included a question about the negative aspects of birds: “I find birds in my neighborhood to be annoying or problematic because….” This statement was followed by 10 negative items (“They are too noisy or they wake me up early in the morning”), reflecting potential ecosystem “disservices” associated with urban birds (Table 1), and the same 5-point Likert scale for each. For all positive and negative statements, respondents indicated their level of agreement with each and we converted these to numerical values for analysis purposes (“strongly disagree” = 1 and “strongly agree” = 5).
Positive and negative statements about birds included in the social survey, with links to the ecosystem-services framework.
We conducted a series of Spearman's correlation tests to examine the links between biodiversity measures and residents' valuations of the services and disservices of neighborhood birds. The first part of our analysis, with individual resident as the unit of analysis, focused on observed species richness within ~200 m of each home, perceived species richness as indicated on the survey, residents' socioeconomic characteristics (income, age, and education level, as indicated on the survey), and their levels of agreement and disagreement with each statement about birds. In the second part of the analysis, we focused on transects as the unit of analysis, with the “commonness” indices and average bird valuation scores for all residents on each transect. Results are presented as means ± SD.
We received responses from 924 residents (52.7% response rate). Twelve surveys with missing addresses or incomplete responses were excluded, leaving 912 surveys for the analysis. Household income in our study sites ranged from around $45,000 to $191,000 (American Community Survey data, 2005–2009), and the median income class for all respondents was $100,000 to $150,000 (Table 3). Respondents included all potential age groups (normally distributed around the mean age of 55; range: 18–100 yr old), and the majority of respondents were college educated (69.4% of all respondents). Checks for nonresponse bias (using paired t-tests) indicated that residents who did not respond to the survey did not differ significantly from respondents with respect to yard composition (grass cover, P = 0.42; canopy cover, P = 0.54). Similarly, income of respondents did not differ significantly from that of residents in the block group (as summarized in 2005–2009 American Community Survey data; paired t-test for income, P = 0.60). Although it is possible that some groups of people were more likely to respond to the survey than others, these tests suggest that the survey results were not biased by lack of response from a particular group of residents. Because our study sites were selected as part of a related study, these demographics are not necessarily representative of Chicago residents.
What Are the Benefits and Annoyances of Birds in Residential Neighborhoods?
We found that residents agreed or strongly agreed with many of the positive statements about birds, and they indicated strongest levels of agreement with the statements “I value birds in my neighborhood because they are pleasing to the eye” (4.42 ± 0.92 across all respondents; 1 = strongly disagree, 5 = strongly agree) and “I value birds in my neighborhood because they are a part of this ecosystem” (4.40 ± 0.80) (Figure 1). Residents indicated the least agreement with the positive statement “I value birds in my neighborhood because they provide spiritual value” (3.43 ± 1.09).
Residents generally did not agree that birds in their neighborhoods were annoying or problematic. For all but 2 of the negative statements, the average rating was between “disagree” and “strongly disagree.” The 2 exceptions were “I find birds in my neighborhood to be annoying or problematic because their droppings make a mess on my outdoor furniture, car, etc.” (2.77 ± 1.28) and “I find birds in my neighborhood to be annoying or problematic because they build nests in or on my house (e.g., chimney, roof, gutters)” (2.41 ± 1.21). But even for those statements, the average response was between “disagree” and “neutral.”
How Is Perceived Bird Diversity Related to Observed Bird Diversity?
We observed a total of 36 bird species across the study sites during the breeding season. Bird species richness at the transect scale ranged from 11 to 21 species (mean = 16.0). This represents only breeding bird communities in the neighborhood and, thus, is less than if we had considered passage migrants and winter residents.
For all survey respondents, the mean perceived species richness was 9.51 ± 13.14 (range: 0–200). Prior to analysis, we removed responses that were left blank (n = 63). We found no relationship between perceived and observed bird species richness (Pearson's r = 0.06, P = 0.07). We also found a weak trend, in that perceived bird diversity became increasingly inaccurate (observed minus estimated species richness) as the observed species richness increased (Pearson's r = 0.11, P = 0.001).
What Are the Links between Services and Disservices and Measures of Bird Biodiversity?
We found that residents' perceptions of species richness were significantly related to their level of agreement with all 11 positive statements (Table 2). In other words, when residents perceived more bird species in their neighborhoods, they agreed more strongly with positive statements about birds. However, observed species richness was related to only 2 of the 11 positive statements. For the negative statements about neighborhood birds, perceived species richness was significantly correlated with 9 of the 10, whereas observed species richness was associated with none (Table 2). As for socioeconomic characteristics, resident-reported age was significantly correlated with 9 of the 11 positive statements and 8 of the 10 negative statements; income was significantly correlated with 3 of the 11 positive statements, and educational level was significantly correlated with 2; neither income nor education was correlated with any of the negative statements (Table 2). Although both age and perceived species richness were correlated with many of the positive and negative statements, age was not correlated with perceived species richness (Spearman r = 0.03, P = 0.39).
Spearman's rank correlations of services and disservices and measures of bird diversity. Relationships with socioeconomic characteristics are shown for comparison. Symbols indicate whether rs was negative (−) or positive (+). Only statistically significant relationships (P < 0.05) are shown. For full text of services and disservices, see Figure 1. Scientific names of birds are given in the text.
Summary statistics for our survey respondents from the Chicago area, Cook County, Illinois, USA.
We also examined commonness indices to determine whether any particular bird species was associated with positive and negative statements averaged across the transect. This analysis was conducted at the transect scale because commonness was determined for each bird species along each transect. None of the bird species was positively linked with the positive statements, but 3 species were negatively related to those statements (House Sparrow, Common Grackle, and Blue Jay; Table 2). In addition, 5 bird species were positively related to statements about birds' annoying or problematic aspects (American Robin, House Sparrow, European Starling, Common Grackle, and Blue Jay). For example, when House Sparrows were more commonly encountered on a transect, residents were less likely to agree with positive statements about birds and more likely to agree with negative statements (Table 2).
We found that residents value many aspects of neighborhood birds, especially those related to aesthetics and birds' place in the ecosystem. Residents also noted several key negative aspects of birds, especially droppings and nests on personal property; however, residents indicated that these annoyances were only mildly bothersome. We found no relationship between residents' perceptions of bird richness and the observed species richness near their homes. Residents' valuations of the benefits provided by birds were often positively related to their perception of species richness yet unrelated to observed species richness. Lastly, we found that several individual bird species were related to many problems or annoyances (and inversely related to positive statements), which suggests that a few common bird species may get noticed more for their negative than for their positive qualities.
How and Why Birds Matter
Wenny et al. (2011) called for increased research in describing and quantifying the ecosystem services provided by birds to inform policymaking and land-use decisions that affect bird conservation. The present study contributes to that research agenda by exploring many of the intangible benefits that birds in urban areas provide and how those benefits are perceived. We found especially high levels of agreement among our respondents regarding the aesthetic benefits of birds in neighborhoods. The value of an aesthetic experience, such as the view of a cardinal out the kitchen window, is difficult to quantify but is nonetheless a valued experience. In the ecosystem-services framework, this type of nonmaterial benefit or experience would fall under the category of “cultural services.” However, some researchers argue that the ecosystem-services framework cannot fully describe the range of benefits, experiences, and values that people may perceive in natural environments (Schroeder 2011). Consider that residents in our study area indicated a high level of agreement with the statement “I value birds in my neighborhood because they are a part of this ecosystem.” Agreement with this statement could reflect the “existence value” that residents attribute to birds, which some researchers have linked with cultural ecosystem services (Chan et al. 2012b). But this statement may also reflect valuation of what birds are, in and of themselves, rather than what they do for us (or what they could do for us in the future; Schroeder 2011). Schroeder (2011) and Satterfield et al. (2013) discussed in more detail the challenges of the ecosystem-services framework with respect to cultural dimensions and environmental decision making.
Urban Residents' Perceptions of the Nature Experience
Recent studies in urban areas suggest that “people experience nature differently than ecologists” (Shwartz et al. 2014). Our results provide some insight into the state of human–nature connections and imply that efforts to conserve or restore biodiversity in our cities may not translate into enhanced human experiences. Our findings join a growing body of research in suggesting that people link cultural services with their perceptions of biodiversity rather than with actual biodiversity. For example, Dallimer et al. (2012) found that psychological well-being of visitors to urban parks was more strongly influenced by the perception of biodiversity than by the actual biodiversity observed during ecological surveys. Likewise, Shwartz et al. (2014) found that people related their well-being to species diversity in public gardens, but they did not actually notice species richness in those gardens, even when it was experimentally enhanced. We found that residents' valuations of birds were linked to their perceptions of bird richness rather than to the actual species richness, which they generally underestimated. In each of these studies, people seemed to appreciate and desire high species richness, but their perceptions of biodiversity were weakly linked (or not linked at all) to actual biodiversity. Alternatively, people with a greater appreciation for birds may estimate higher species richness (whether accurately or not).
People seem to underestimate the bird diversity in their neighborhoods, which has implications for the “extinction of experience” problem. “Extinction of experience” refers to a theorized cycle of increasing separation between humans and nature over time, wherein biological impoverishment leads to lowered expectations of environmental quality and to apathy in human residents, followed by greater degradation and losses (Pyle 2003, Miller 2005). Our results showed that people do not fully experience the biodiversity in their own neighborhoods, and increased species richness in a neighborhood does not translate to increased perceived species richness by residents. Thus, efforts to increase urban residents' awareness of the nature around them may be a key strategy for combating the extinction of experience problem. Citizen science programs have been shown to enhance city dwellers' awareness of the “everyday biodiversity” in their yards and neighborhoods (Cosquer et al. 2012). In addition, new web-based and smartphone applications make citizen science and identifying backyard wildlife species easier than ever. For example, the iNaturalist platform allows users to snap a photo or record the song or call of a species on their smartphone and upload the observation along with its location, even if they are unsure of the species identity. Then other iNaturalist users help identify the species in question. The Cornell Lab of Ornithology's free Merlin app ( http://merlin.allaboutbirds.org/) draws on citizen science observations along with the user's location, time of year, and bird characteristics to provide a “bird ID wizard.” This allows users to easily narrow the list of possible matches for the bird observed through the kitchen window. These types of platforms offer engaging ways for people to connect with nature in their own neighborhoods that may be more accessible for the layperson than traditional wildlife field guides.
Our results indicate that while birds were generally well liked and annoyances were minor, several common and visible urban species, such as the House Sparrow, European Starling, and Blue Jay, may attract attention for their negative qualities. The House Sparrow and European Starling are both nonnative species that tend to congregate in noisy groups. The Blue Jay, although colorful and native to the United States, has a raucous, harsh call and is sometimes seen as a “bully” that dominates birdfeeders. Interestingly, we did not see trends indicating that people link individual bird species with positive qualities. There is some evidence from other studies that people exaggerate negative effects of birds to a point that their perceptions do not accurately represent reality (e.g., in causing crop damage; Weatherhead et al. 1982, Basili and Temple 1999, Triplett et al. 2012). It is possible that negative qualities of certain common bird species may “stick” with residents (more so than positive aspects) and affect their perceptions of other birds in the neighborhood.
It is important to recognize that our study sites were located outside of forest preserves, primarily in middle- to high-income neighborhoods (Table 3), and all transects but 1 were in areas with a median household income greater than that of Chicago ($47,270). However, income may not be a large factor in explaining human–bird relationships. Our results generally indicated a neutral relationship between income and valuation of birds, although income was positively correlated with 2 values for birds and negatively correlated with 1. Not surprisingly, we found that age was often related to positive perceptions of birds, which aligns with other studies in highlighting (1) increasing interest in bird watching with age (Bjerke and Ostdahl 2004) and (2) age as an important predictor for bird feeding (Davies et al. 2012). Another recent study found that socioeconomic variables did not significantly predict residents' valuation of urban birds (e.g., income, education, and age were not significant variables in models predicting Seattle residents' willingness to pay for finch or corvid conservation; Clucas et al. 2014). More work is needed to shed light on this question.
Although birds provide many important ecosystem services (Whelan et al. 2008, Wenny et al. 2011), perhaps one of their most important roles is as a relatable component of the broader environment to which people can develop attachments. Our results suggest that birds are highly likable urban species; residents value their neighborhood birds for many different reasons, while the negative aspects of birds are not seen as significant problems. As such, birds may represent an important connecting point between urban residents and the land managers and environmental policymakers focused on enhancing ecosystem services.
There is some evidence that values for birds are linked with yard stewardship activities. Although much analysis on wildlife-friendly activities in yards has focused on socioeconomic characteristics (e.g., the relationship between age and bird feeding; Davies et al. 2012, Clucas et al. 2014), residents' values for birds may be just as important. For example, in a related study, we found that residents' bird valuation scores were more important than socioeconomic factors in explaining the number of wildlife resources and the vegetation complexity in yards (J. A. Belaire et al. personal observation). Other studies have suggested that people and birds may engage in a sort of positive feedback loop, in which people enjoy bird observations in their yards and thus increase their wildlife gardening efforts to draw even more birds (e.g., Head and Muir 2006, Goddard et al. 2013). Birds have also been linked with environmental behaviors beyond the yard scale: Framing climate change in terms of potential harm to birds significantly increases people's interest in activities that reduce carbon footprints (Dickinson et al. 2013).
More broadly, human relationships with nature can affect public support for conservation or management strategies (Fischer et al. 2011). Understanding cultural ecosystem services may provide a “foot in the door” for conservation scientists and managers to begin discussions about real-world problems in ways that are relevant to society (Milcu et al. 2013). Many people already hold strong concerns and values regarding nature, and strategies that highlight those existing values may be most effective in changing environmental behavior (Clayton et al. 2013). For example, if we wanted to appeal to residents in our study area to improve the bird habitats in their neighborhoods, we could emphasize the aesthetic benefits of birds while simultaneously addressing residents' concerns about droppings or nest building.
Humans and nature are intertwined in complex ways that are becoming increasingly important to understand (Turnhout et al. 2013). People and birds will overlap in space more and more frequently as urban growth accelerates worldwide, and the character of our interactions with one another will shape our shared future. As Mark Cocker eloquently notes in his book Birds & People, “environmentalists cannot by themselves oversee the protection of birds. It is only when whole societies collectively believe in the goal that it is attainable” (Cocker 2013:10). The results of the present study suggest that urban residents already value birds' contributions to their lives. Efforts to strengthen people's connections to birds could lead to even greater “intangible” benefits for people—and conservation support for birds.
We thank C. Watkins for advice in social survey design and delivery and H. Gin for help with survey distribution and pick-up. We also thank the many residents of Cook County, Illinois, who graciously participated in the survey.
Funding statement: This study is based on work supported by the National Science Foundation (grant DGE-0549245) and by the University of Illinois at Chicago's Department of Biological Sciences Elmer Hadley Graduate Research Award.
Ethics statement: The methods for this research follow institutional ethics protocols and were approved by the University of Illinois at Chicago Institutional Research Board (no. 2012-0434) and Animal Care Committee (no. 12–066).