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Article
David Westmoreland, Auteur ; Matthew Schmitz, Auteur ; Kevin E. Burns, AuteurAvian embryos are incubated at temperatures only 2-6 degrees C below that at which hyperthermia begins to influence survival. In habitats where sunlight directly strikes the eggs, even for short periods, heat gain may be a substantial threat to [...]
Article
David Westmoreland, Auteur ; Richard A. Kiltie, AuteurHigh variation in egg coloration among birds has traditionally been explained as adaptation for camouflage. We tested this hypothesis by conducting reciprocal clutch exchanges (n=301) among Brewer's blackbirds Euphagous cyanocephalus, red-winged[...]
Article
The value of egg coloration as crypsis, once accepted as a general principle, has recently been questioned because most experiments have failed to show that egg coloration deters predation. The nest-crypsis hypothesis postulates that, among spec[...]
