Tuesday, July 20, 2010

Yellow-throated Vireo

For almost three years, I have heard Yellow-throated Vireos at our Dundas banding station.  Surprisingly, this is the first one we've caught. Usually this species is outnumbered by Red-eyed Vireos, a similar-sounding bird, in the forest edge habitat they share. In the Northeast during the early 1900s, Yellow-throated Vireos almost disappeared.  Birders thought the population decline was caused by spraying for Dutch Elm Disease.

Yellow-throated Vireos are monogamous.  To attract females in the spring, unmated males begin building nests.  The females take over, and the male accompanies the female to and fro, even if he does not help with subsequent nest construction. He begins calling if he loses contact with his mate.  Once the young have fledged, each member of the pair goes its own way.

As often in this blog, my primary source of information is the AOU's The Birds of North America, in this case: Rodewald, Paul G and Ross D. James. 1996.  Yellow-throated Verio (Vireo flavifrons), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu.bnaproxy.birds.cornell.edu/bna/species/247

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