Birds are warm-blooded, feather-bearing, egg-laying, amniotic vertebrates having the fore-limbs modified into wings. Ornithology is the scientific study of birds.- Category ID : 423009
Notes on clutch size optimization in birds, reproductive success, embryo development, incubation and the hatching process, with links to other similar articles.
The colossal body size, the relinquishment of flight and the extreme thermal stresses on the ground make the examination of an ostrich’s lungs rewarding.
Skeletons are essential for the identification of fossils, bones from archaeological sites and food items taken by predators as well as histological and physiological studies.
Songs identify the species of the singing bird. The territorial song of males serves the dual purpose of territorial proclamation directed at other males and of mate attraction directed toward females.
Female birds of some species tend to choose as mates those males holding the most desirable territories, but there is little evidence that females preferentially select males with different degrees of ornamentation.
Most birds are monogamous, but in some species the occurrence of polygyny, where one male mates with more than one female, is related to high-quality territories with an abundance of resources.
The young of passerines when first hatched are naked, blind, and helpless and require much care which involves feeding, training and protection from predators.
Most birds create the required temperature by sitting on their eggs but some transfer heat through their webbed feet, and the megapodes of Australia bury them in a mound of decaying vegetation.
Article from the Princeton Weekly Bulletin outlining how Biologist Martin Wikelski is helping to settle the long-standing debate over how migratory birds manage to navigate in darkness and bad weather.