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Searchable database of the regions of a bird’s brain.
Comprehensive article on the great challenge faced by long distance migrants which have to find their way to winter quarters and return to their breeding grounds in the spring. [PDF]
Notes on the bird reproductive system and the development of the embryo, with explanatory drawings and photographs.
Notes on clutch size optimization in birds, reproductive success, embryo development, incubation and the hatching process, with links to other similar articles.
Article describing the anatomy of this distinctive feature of birds which, in addition to eating, can be used for grooming, manipulating objects, killing prey, probing for food, courtship, and feeding the young.
Based at the USGS Patuxent Wildlife Research Center, issues permits to researchers in the United States who place uniquely numbered bands (rings) on birds' legs. Site features the history of banding and reporting of bird band observations.
Article describing how the young of some birds are fed on special secretions from their parents.
Article explaining how air sacs play an important part in the gaseous exchange in birds, with many diagrams.
Images and data about skulls of western Palearctic and Tropical species, with complete skeletons of some species.
Article describing how birds use their syrinx, throat and beak to make a wide range of tones without the sophisticated muscle structure possessed by humans.
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