Three subspecies of the peregrine falcon inhabit North America: the American (Falco peregrinus anatum), Arctic (Falco peregrinus tundrius), and Peale’s (Falco peregrinus pealei). Peregrine falcons are roughly crow-sized—about 15 to 21 inches...
Birds; Birds of prey; Endangered species; Migratory birds; Raptors;
This is a fact sheet describing the peregrine falcon in North America. It outlines the history of the bird, its decline in the mid-twentieth century due to DDT, and its successful recovery in the years since.
This is a booklet that describes various migratory birds that are familiar in the United States. The species covered include the American robin, the American goldfinch, the Ruby-throated hummingbird, the eastern bluebird, the barn swallow, the gray...
Birds; Grasslands; Migratory birds; Perching birds; Research; Species of concern;
This is a description of the molt and aging criteria for four grassland passerines. The species covered are Sprague's Pipit, Grasshopper sparrow, Baird's sparrows, and Chestnut-collared Longspurs. Molt information is important for determining...
Birds; Migratory birds; Monitoring; Perching birds; Research; Statistics; Species of concern; Wildlife management;
This is a status assessment and conservation plan for the Cassin's Sparrow. It includes a description and natural history of the bird, as well as range information pertinent to breeding, migration and wintering, monitoring activities, population...
Bar-tailed Godwits are large wading birds at about 37 to 45 cm. The Bar-tailed Godwit is a mottled brown in the upper body and a lighter buff below. It has a white underwing, and a long, slightly upturned bill. As the name suggests, the white tail...
This is a guide to altricial passerines. It has an explanation of variables used for aging birds and an explanation of methodology employed, and provides information obtained while recording the early aging of the Dusky Flycatcher, the Carolina...
