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Brown-headed Cowbird
| 제목: | Brown-headed Cowbird
| | 올린이: | funny (from@alt.binaries.images.fun)
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| 해상도: 691x463
파일크기: 85763 Bytes
등록시간: 2006:03:06 23:28:00
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Brown-headed Cowbirds are brood parasites. They do not build a nest,
but lay their eggs in other bird's nest, mostly warblers and vireos.
Ornithologists believe that this is an adaptation from the time when
cowbirds followed buffalo herds. They didn't stay in one place long
enough to build a nest and incubate eggs. We have many cowbirds here.
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Brown-headed Cowbird (Molothrus ater)
French: Vacher à tête brune German: Braunkopf-Kuhstärling Spanish: Tordo Cabecipardo
Other common names: Common Cowbird
Subspecies and Distribution
M. a. obscurus (J. F. Gmelin, 1789) – breeds along Pacific seaboard from S Alaska S (E to the Cascades and Sierra Nevada) to NW & N Mexico (N Baja California, also on mainland S to Oaxaca); N populations migrate to S parts of breeding range, in Mexico extending to S Baja Califonia.
M. a. artemisiae Grinnell, 1909 – breeds from W Canada (interior British Columbia E to SC Manitoba) S in W USA (E from the Cascades and Sierra Nevada) to California, Nevada and New Mexico; migrates S to Mexico (S to Michoacán).
M. a. ater (Boddaert, 1783) – breeds from SE Canada (S Ontario E to Newfoundland) S throughout E USA to C Texas, Gulf Coast and C Florida, and in E Mexico S to Tamaulipas; winters in Florida and in Mexico S to Oaxaca.
Also breeds in Yukon (NW Canada); race undetermined, possibly artemisiae. |
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동물그림창고 똑똑전화 누리집
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