Avian Species - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/avian-species
WebAvian species, particularly migratory birds inhabiting the temperate zone of North America, Europe, or Asia, display very pronounced physiological and behavioral events throughout their annual cycles such as increased food intake resulting in large depositions of body fat, molt of feathers, migration, and reproduction.
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