Sunday, September 11, 2011

Black-and-white Warbler

The Black-and-white Warbler is breeds commonly in eastern North American and central Canadian forests. This warbler winters from the southern United States south through much of Latin America.  Possibly due to its tolerance of disturbed habitat, it is one of the few neotropical migrants not suffering widespread population declines. (This photo was taken during May's migration.)

Male Black-and-white Warblers, like the one in the photograph above, migrate earlier in the spring than their mates. Once on their breeding territories, the males establish territories.  Females are known to take males to territorial boundaries.  Here aggressive interactions take place between owners of adjacent territories.  Observing these conflicts, the females appear to assess the fitness of the males. Females build their nests, usually on the ground near a tree trunk or fallen log. Females do all the incubation, although are often fed at the nests by their mates. Both sexes cooperate in raising the young (Kricher 1995).

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