Brown-headed cowbirds in ponderosa pine/ Douglas-fir-dominated landscapes in the northern Rocky Mountains. Studies in Avian Biology 18:73-79.Hejl, S. J. and J. S. Young. 1999 . Brown-headed cowbirds in ponderosa pine/Douglas-fir dominated landscapes in the northern Rocky Mo...
DESCRIPTION: Brown-headed Cowbird is relatively small, with short and conical bill, rather long and pointed wings, and slightly rounded tail. Adult male is uniformly glossy greenish back, with brown head and neck. It has black eyes, legs and feet. The bill is dull grey. Adult female is br...
The meaning of BROWN-HEADED COWBIRD is a cowbird (Molothrus ater) widespread in the U.S. and southern Canada in which the male is black with a brown head and the female is gray. How to use brown-headed cowbird in a sentence.
Related to brown-headed cowbirds: North American cowbirdcow·bird (kou′bûrd′) n. Any of various blackbirds of the genus Molothrus, especially the common North American species M. ater, that lay their eggs in the nests of other birds and are often seen accompanying herds of grazing cattle...
根据第一段第一句 "Brown-headed cowbirds are obligate brood parasites(寄生生物). That means they lay their eggs in the nests of other birds…chicks to somebody else." 可知,褐头燕八哥是寄生生物,所以推测出它要依附于其他鸟类。故答案选A。 (2) 词义猜测题。根据第一段倒数第二句 "Yellow warblers...
Brown-headed cowbirds, Molothrus ater, frequently parasitize red-winged blackbirds,Agelaius phoeniceus . The presence of a brood parasite, unrelated to both host nestlings and parents, has provoked speculation regarding within-brood food allocation and parental provisioning. This study is the first to ...
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What cues do Brown-headed Cowbirds use to locate Red-Winged Blackbird host nests? I examined ecological and behavioural variables influencing the susceptibility of red-winged blackbird, Agelaius phoeniceus, nests to brood parasitism by b... ED Clotfelter - 《Animal Behaviour》 被引量: 697发表: ...
Brown-headed cowbirds have female-only nest searching and, at least in the eastern subspecies, a larger Hp in females than in males, suggesting that nest searching influences cowbird Hp size. We predicted that female brown-headed cowbirds housed in aviaries lacking host nests would have a ...
The agonistic and sexual functions of vocalizations of male brown-headed cowbirds, Molothrus ater Functional analyses of three vocalizations of male brown-headed cowbirds, Molothrus ater, are presented and it is shown that two of these function as songs. Perched song (PS) is given by stationary...