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...
1Brown-headed cowbirds are obligate brood parasites(寄生生物). That means they lay their eggs in the nests of other birds, leaving all the hard work of incubating the eggs and feeding the chicks to somebody else. Luckily, many of those other species have evolved some anti-parasitic defenses....
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 M...
Instead of learning from parents, they acquire their songs through social interaction with adult cowbirds, leading to regional vocal dialects and variation in song structure. Listen to the brown-headed cowbird calls: Both males and females produce a variety of whistles, clicking sounds, and chatter...
Detection probabilities at point-count center for the three focal grassland songbird species and Brown-headed Cowbirds were similar between treatments and ranged from 0.81 to 1.00, indicating that a majority of individuals were detected (Ogden, 2017). Grassland Bird and Butterfly Responses to Sericea...
genus Molothrus,Molothrus- cowbirds Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc. Want to thank TFD for its existence?Tell a friend about us, add a link to this page, or visitthe webmaster's page for free fun content. ...
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.
Brown-headed cowbirds are common in North America Lesson Quiz Course 1.4Kviews Cowbird Eggs You might think, given this method of reproduction, that brown-headed cowbird eggs would be difficult to spot, right? Actually, this is not the case. Depending on the type ofhost bird(the bird whose...
Males brown-headed cowbirds are easily identified by their distinct brown heads and glossy black bodies. Like many female birds, the female brown-headed cowbirds are drab, making them tougher to spot; they are brown with a lighter-colored head and belly. The female's abdomen also has darker ...
Our results support the host preference hypothesis that brown-headed cowbirds choose nests to parasitize based on the individual attributes of hosts, although they may use additional cues such as the nest structure within the cavities and appearance of host eggs.Animal BehaviourBrian D. PeerWei ...