Princeton University Press, 2020, 642 pages; $40 It is certainly a fitting monument to its author. Peter Vickery was one of Maine’s leading ornithologists. Although he and his wife Barbara lived in Richmond, Peter worked as an avian ecologist at Massachusetts Audubon Society (where we first became friends) for over 20 years. Nonetheless, he had put down roots in Maine, and Ralph Palmer’s classic “Maine Birds” became “his Bible,” according to Barbara. Written in 1949, it was the standard reference on Maine’s avifauna. Nature, however, does not stand still, and as the twentieth century progressed from its midpoint into the next, the book’s findings were being overtaken.