The Eurasian hobby (Falco subbuteo), or just simply hobby, is a small, slim falcon. It belongs to a rather close-knit group of similar falcons often considered a subgenus Hypotriorchis. This falcon is 29–36 cm in length with a wingspan of 74–84 cm and a weight of 175–285 g. This species breeds across Africa, Europe and Asia. It is a long-distance migrant, wintering in Africa and Asia.
It is a bird of open country such as farmland, marshes, taiga and savannah. They are widespread in lowlands with scattered small woods. It is an elegant bird of prey, appearing sickle-like in flight with its long pointed wings and square tail, often resembling a swift when gliding with folded wings. It is fast and powerful in flight and will take large insects, such as dragonflies, which it transfers from talons to beak and eats while soaring slowly in circles. It also captures small bats and small birds in flight. Its speed and aerobatic skills enable it to take swallows and even swifts on the wing, and barn swallows or house martins have a characteristic "hobby" alarm call. It is known to harass swallows while they are roosting and dispersing from roosts. When not breeding, it is crepuscular, hawking principally in the mornings and evenings. While on migration, they may move in small groups.
Source : Wikipedia