5400 x 3600 px | 45,7 x 30,5 cm | 18 x 12 inches | 300dpi
Data acquisizione:
5 ottobre 2015
Ubicazione:
Botswana
Altre informazioni:
The bateleur is a colourful species with a very short tail (ecaudatus is Latin for tailless) which, together with its white underwing coverts, makes it unmistakable in flight. The tail is so small the bird's legs protrude slightly beyond the tail during flight. The bateleur is sexually dimorphic; both adults have black plumage, a chestnut mantle and tail, grey shoulders, tawny wing coverts, and red facial skin, bill and legs. The female additionally has tawny secondary wing feathers. Less commonly, the mantle may be white. Immature birds are brown with white dappling and have greenish facial skin. It takes them seven or eight years to reach full maturity. The bateleur is diurnal, and hunts over a territory of approximately 250 square miles (650 km2) a day. Bateleurs are hunters and scavengers; birds such as pigeons and sandgrouse are preferred prey items, although it may attack small mammals and also takes carrion. The bateleur is generally silent, but on occasions it produces a variety of barks and screams. The bird spends a considerable amount of time on the wing, particularly in low-altitude glides."Bateleur" is French for "street performer" which included performers such as tight-rope walkers. This name implies the bird’s characteristic habit of rocking its wings from side to side when gliding, as if catching its balance.At San Diego Zoo, United States The bateleur breeds in December–March. It constructs a well-concealed nest in trees, laying a single egg which is incubated by the female for 42 to 43 days, with a further 90 to 125 days until fledging. Bateleurs pair for life, and will use the same nest for a number of years. Unpaired birds, presumably from a previous clutch, will sometimes help at the nest. Bateleur eagles are among a group of raptors that secrete a clear, salty fluid from their nares whilst eating. According to Schmidt-Nielson's (1964) hypothesis, this is due to the general necessity for birds to use an extrarenal mechanism
