We document 26 incidents of sunning behavior in 5 species of Accipitridae, including Crested Eagle (Morphnus guianensis), Black Hawk-Eagle (Spizaetus tyrannus), Ornate Hawk-Eagle (Spizaetus ornatus), Roadside Hawk (Rupornis magnirostris), and White Hawk (Pseudastur albicollis), during a camera-trap survey conducted in Madre de Dios, Peru, in 2014. The sunning behavior was observed in forest clearings along logging trails and on a dirt road. We recorded 2 high-intensity sunning postures: “full-spreadeagle,” in which the bird lies horizontally on the ground with wings outstretched, tail fanned, and head somewhat raised; and “full-spread,” in which the bird stands while holding its wings out at right angles to the body. Sunning is a maintenance behavior observed in many bird species and has been reported in Accipitriformes in various habitats, but it is not commonly observed in tropical rainforests because of low visibility. Our camera traps recorded sunning behavior from 0931 h to 1400 h, a period in which ambient temperature increased until reaching its maximum around 1400 h. The most likely function of sunning in Accipitriformes in the rainforest is an anti-ectoparasite strategy. Camera-trap monitoring has been useful in detecting unusual interactions and diel patterns of activity, and researchers can obtain a wide range of natural history, ecological, and behavioral insights that would be difficult to obtain using traditional methods. We recommend analyzing “bycatch” data from camera traps to recover information about bird behaviors that would otherwise be unattainable.

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