Cowbird (Brown-headed Cowbird)

A young Cowbird is fed by its parent Yellow Warbler 

A pair of Cowbirds  一対のCowbird  

All Cowbirds lay their eggs in nests of other species*. Cowbirdは、他の種類の鳥の巣に、こっそり自分たちの卵を産み落とします。Cowbirdの卵とは知らず、その巣の親鳥は、Cowbirdの子を育てます。Cowbirdは、この習性のため、賢い?、または、ずるい鳥として悪名高いです。

Videos: A Brown-headed Cowbird has laid an egg in this Northern Cardinal nest | Chickadee feeding Cowbird fledgling (America)
Nature of the cuckoo duck - David Attenborough - BBC wildlife (Europe)

Brood Parasitism: Defense strategies against brood parasites have been developed by many host species. ホスト側の鳥の親は、この産み落としをどう防ぐのでしょう
Brood parasite (托卵-たくらん-)
Parasitism (寄生)

10967 160308  How Does a Cowbird Learn To Be a Cowbird? - Audubon

Field Guide to the Birds of North America (Washington, D.C.: National Geographic Society, 1991)
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