On Saturday morning, May 29, the weekly Hanover Conservation Council bird trip  
went to the Mink Brook Natural Area east of Route 10. Near the end of our trip  
we heard a vireo giving a few short phrases. At first glace I saw its bluish head,  
and thought it was a blue-headed vireo. But good looks at it showed it was a warbling  
vireo. However, its vocalizations, though not many, were in character like those  
of a blue-headed or red-eyed, or any other vireo but a warbling vireo.

Sibley's description of the song of the warbling vireo is like the one we are  
all familiar with. However, on the page showing the yellow-throated vireo he writes,  
"Song in  vireos is learned. There are numerous records of Yellow-throated singing  
like a Blue-headed, and vice versa; presumably the same pehnomenon occurs with  
other species as well and should be considered when identifyhing birds by sound."  
Could this bird have leared a song so different from the usual warbling vireo  
song?

Another suggestion was that it might be a female.

The bird was on Brook Road between 0.1 and 0.2 miles  from Route 10.

Bob Norman

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