North America's smallest falcon, the American Kestrel (Falco sparverius), has declined across the continent since the 1970s, ...

North America’s smallest falcon, the American Kestrel (Falco sparverius), has declined across the continent since the 1970s, ...

A female American Kestrel nestling with its recently attached VHF back-pack style transmitter in the Virginia Piedmont study area. Feathers cover all but the antenna.

Some of the most common falcons in the United States include the American kestrel, the gyrfalcon, and, of course, the ...