Falcons are strong efficient hunting birds. With very sharp eyes, falcons hunt from the air, looking down at small animals on the ground or at birds flying beneath them. Types of Falcons: Falcons are one species within the Raptor family called Falco. Some are called falcons, like the Peregrine Falcon, while others include Kestrels and Hobbys. Other raptors related to falcons include Hawks, Owls, and Eagles. Geographic Range: Falcons are found through the world, except for Antarctica. Some falcons are migratory, changing location for summer and winter seasons, while others maintain their territory year-round. Length: The largest falcon, called a Gyrfalcon, ranges in length from 51 to 65 centimeters (20 – 26 inches ). The smallest falcon in the Falco family, is the American Kestrel. An adult American Kestrel may be 19 to 21 cm ( 7 – 8 in ) in length. Mature female falcons are almost always bigger and heavier than a mature male falcon of the same type. Wingspan: The Gyrfalcon has a wingspan measuring 124 to 160 cm ( 49 to 64 in ) in length while the American Kestrel wingspan is 50 to 61 cm ( 20 – 24 in ). Weight: The American Kestrel weighs 100 to 120 g ( 3.5–4.2 oz ), while the Gyrfalcon weighs from 1180 to 2100 g (2.6 to 4.6 lbs). Food: Falcons are hunters and will catch small reptiles and mammals, including bats, but also hunt other birds, such as pigeons, ducks and songbirds. Smaller kestrels, which are part of the falcon family, may prefer to eat insects but will also catch small mammals when there are fewer insects, for example during winter months.