Hawk mimicry in cuckoos and anti-parasitic aggressive behavior of barn swallows in Denmark and China
Hosts of brood parasites defend their nests against parasitism by aggression and subsequently, if parasitized, by rejection of the parasite egg or nestling. Cuckoos have evolved plumage mimicry with ...
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10 fascinating barn swallow facts
Estonia and Austria, two European countries, have named this species their national bird. George Grinnell played a huge role in early conservation. After he became editor of Forest and Stream magazine ...
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