Saturday, May 31, 2014

Blackburnian Warbler

One of the highlights of spring migration is finding a male Blackburnian Warbler. The bird almost glows among the green foliage. On the breeding grounds, this warbler is usually found high in trees, where it forages for caterpillars. During migration they also are often found in the treetops, although this individual was netted near our water feature.

Blackburnian Warblers, like the Canada Warbler I wrote about in the last post, are threatened by tropical deforestation in their winter range. The species is less frequently seen in their breeding grounds if forests are fragmented or diseased. Nevertheless, Breeding Bird Survey data indicate their numbers are stable (Morse 2004).

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