A new study shows that one group of Galápagos yellow warblers responds to intruders more aggressively than others. It adds compelling new evidence to a theory about angry birds. Some bird species, ...
Shimmery. Spiky. Shaggy. Soft. Feathers are what make birds so alluring—but these photographs remind us that they also tell a story about the science of evolution. It may seem wildly impractical, but ...
Typed catalog of birds collected by Holt and colleagues in Brazil and Venezuela from 18 September 1930 to 12 June 1931 during the National Geographic Society, Brazilian - Venezuelan Expedition.
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