Date: 3/17/17 7:56 pm From: Robert Mulvihill <robert.mulvihill...> Subject: Chickadees in SW PA
I have been following the thread about the chickadee situation in and around Pittsburgh. As Matt Webb said, we have banded chickadees as one of the target birds for Neighborhood Nestwatch, and we have identified hundreds of them using a combination of in hand measurements of wing length, tail length, and body mass, with some attention also to the amount and distribution of white edging in the greater coverts and tertials.
Based on this, we have identified about 600 chickadees--roughly 70% Carolina (best fit), 20 % Black-capped (best fit), and 10% undetermined (presumed hybrid). I have mapped these at different scales, for those who are interested:
The bar chart shows the breakdown of chickadees by latitude; Map 1 plots all those records; Maps 2&3 zoom in toward North Park. In all of the graphics, Carolinas are designated in blue; Black-capped in red; hybrid/unknown in green.
Note: Neighborhood Nestwatch extends 50 mi. in all directions from downtown Pittsburgh.
Robert S. Mulvihill Ornithologist National Aviary 700 Arch Street Pittsburgh, PA 15212 412-258-1148 <Robert.mulvihill...> <Robert.mulvihill...>
*The National Aviary <http://www.aviary.org> works to inspire respect for nature through an appreciation of birds.*