The Pennsylvania Migration Count (PAMC) is an annual one-day snapshot of bird populations within our state. Which species are present, and where are they? How many are there? Do migratory patterns change from year to year?
Lots of questions but plenty of answers, thanks to the new book called "Terrestrial Vertebrates of Pennsylvania: A Complete Guide to Species of Conservation Concern," edited by Michael A. Steele, Margaret C. Brittingham, Timothy J. Maret and Joseph F. Merritt.
At the beginning of this month when about 5,000 red-winged blackbirds fell from the sky in one night in Arkansas, biologists were called on to put a damper on public speculation about pesticides and secret military tests by reminding everyone how many birds there are and how many die. They often do so as a result of human activity, but in far more mundane and dispiriting ways than conspiracy buffs might imagine