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1 June 2013 Food Habits of Long-Eared Owls (Asio otus) at a Winter Communal Roost in Texas
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Abstract

We analyzed mammalian prey from owl pellets recovered at a winter roost of long-eared owls (Asio otus) in northwestern Irion County, Texas. Of 1,232 prey identified, the most common species were cotton rats (Sigmodon hispidus, 36%), plains harvest mice (Reithrodontomys montanus, 23%), deer mice (unidentified Peromyscus, 14%), and pygmy mice (Baiomys taylori, 10%). Approximately 80% of the biomass of the diet was the cotton rat. Other important prey were Crawford's gray shrews (Notiosorex crawfordi, 7%), hispid pocket mice (Chaetodipus hispidus, 6%), and Merriam's pocket mice (Perognathus merriami, 2%). These species are rare in the reported diet of long-eared owls and represent the first information on winter food habits in Texas in the southern portion of the range of this owl.

Analizamos los restos de mamíferos en egagrópilas recuperadas en un refugio invernal de búhos orejudos (Asio otus) en el noroeste del condado de Irion, Texas. De las 1,232 presas identificadas, las especies más comunes fueron las ratas de algodón (Sigmodon hispidus, 36%), ratones de llanos (Reithrodontomys montanus, 23%), ratones ciervo (Peromyscus no identificada, 14%) y ratones pigmeos norteños (Baiomys taylori, 10%). Aproximadamente el 80% de la biomasa de la dieta fue de la rata de algodón. Otras especies de presas importantes fueron la musaraña gris (Notiosorex crawfordi, 7%), el ratón de abazones crespo (Chaetodipus hispidus, 6%) y el ratón de Merriam (Perognathus merriami, 2%). Estas especies son raras en la dieta registrada de búhos orejudos y representan la primera cita de hábitos de invierno en Texas al sur de la distribución de este búho.

Reagan L. Noland, Terry C. Maxwell, and Robert C. Dowler "Food Habits of Long-Eared Owls (Asio otus) at a Winter Communal Roost in Texas," The Southwestern Naturalist 58(2), 245-247, (1 June 2013). https://doi.org/10.1894/0038-4909-58.2.245
Received: 5 February 2012; Accepted: 1 April 2013; Published: 1 June 2013
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