Date: 3/16/17 10:52 am From: Grant Stevenson <pahawkowl...> Subject: chickadee northern distribution may be going north
Let's not forget that chickadee species can and will imitate each others voices, wherever they are, as retired professor from Mt. Holyoke College Sue Smith said to me after I inquired about a "sighting" and "hearing" myself. She produced the BCCH BNA and THE BLACK-CHAPPED CHICKADEE: BEHAVIORAL ECOLOGY AND NATURAL HISTORY, available in book stores or through your library's Inter-library Loan program. Dr. Frank Gill of Academy of Natural Sciences in Philadelphia, who wrote a major textbook for undergraduates ORNITHOLOGY (and AOU Auk articles on chickadee DNA results (also DNA study on Golden-winged Warblers), is a good Inter-library Loan basic source of concepts regarding this issue. Dr. Smith also told me that so called vagrant Mountain Chickadees in the East were probably Black-capps which hit windows, survived, and the absence of contour feathers on their heads from the strike grew back in in white.
To be sure, more of sight/hearing data with numbers and place and local weather is what scientists need (?), not discussion; let the data decide. And local weather data from more than one day around the trips if possible. Why doesn't eBird ask for more of this meteorological context? Maybe birders should insist by including the weather in the notes section?
Not to be a hypocrite, I hope to get out today/tomorrow, as chickadees are just post snowfall birds. also important are the other species.
As birders' integrity is always checked by conservative "doubters" as opposed to liberal "believers", the data needs to tell us what is correct for us, but needs the scrutiny of more experienced birders which know by distribution and other factors what species belong where-when, and liberals possibly setting the course for new global warming distributions for common birds.