Latest Dark-eyed Junco Stories
It's all about the grandkids! That's what a team led by an Indiana University biologist has learned about promiscuous female birds and why they mate outside their social pair.
In a case of life imitating art, avian scents given off by male songbirds have the females (and males) flocking in.
Individual male birds can differ dramatically in their behavior, and this difference is often due in part to how much testosterone they produce.
A field study of the relationship between testosterone and natural selection in an American songbird, the dark-eyed junco, has defied some expectations and confirmed others.
Two recently diverged populations of a southern California songbird produce unique odors, suggesting smell could contribute to the reproductive isolation that accompanies the origin of new bird species.
Birds' alarm calls serve both to alert other birds to danger and to warn off predators.
Testosterone may help some songbirds "live fast, die young and leave a good-looking corpse," as the adage goes.
The Dark-eyed Junco (Junco hyemalis) is the best-known species of junco, a genus of small American sparrows. Adult juncos are generally grey on top and have a white belly and white outer tail feathers. The bill is usually pinkish. Other than those similar characteristics, there are several regional variations: The Slate-colored Junco (J. hyemalis hyemalis) has a dark slate-grey head, breast and upper parts. Females are brownish grey. It is found in North America in taiga forests from...
- Having no light.
- Of or relating to the region of a body of water that is not reached by sunlight and in which photosynthesis is unable to occur.