We studied the food of nestling Rusty-margined (Myozetetes cayanensis) and Social flycatchers (M. similis) in 1998 and 1999 at Barro Colorado Island, Panama. Food samples were taken from nestlings by fecal analysis and the neck-collar method. In both species most food items were beetles, winged ants, dragonflies, spiders, and seeds of Miconia spp. Water animals (mainly backswimmers, freshwater snails, and dragonfly larvae) constituted 7.8%–13.5% of animal prey. The nestlings of the Social Flycatcher received significantly more flying insects, while the proportion of fruits and seeds was significantly higher in the diet of Rusty-margined Flycatcher nestlings. Length of animal prey varied from 4–25 mm in the Rusty-margined Flycatcher and 2–50 mm in the Social Flycatcher, and the length of fruits and seeds were 4–11 mm and 2–19 mm, respectively. The average length of animal food was larger in the Rusty-margined Flycatcher despite its slightly smaller size. The number of broods with nestlings or fledglings present in the study area was positively correlated with the abundance of fruits in the Social Flycatcher.
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Vol. 74 • No. 2