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...
Similarity of Appearance (Threatened); Surveying; Reptiles; Partnerships; Work of the Service;
The bog turtle is the smallest turtle in North America. The species is protected under the Endangered Species Act and faces great threats from both poaching and habitat degradation as the wetlands where they live have disappeared dramatically over...
Microscopic view of Atlantic salmon eggs near hatching. By March, and the onset of Spring, Atlantic salmon eggs are well developed. The head, eyes, heart, fins, vertebrae and blood vessels can be seen. Hatching produces a "sac fry" which...
Close-up of an immature ring-billed gull in Siskiyou County. For more information about birds visit http://www.fws.gov/birds/. Eyes of ring-billed gulls don't turn pale until later in life, and this is a young bird (in its second calendar year,...
