Angel wing, also known as airplane wing,[1]slipped wing, crooked wing, and drooped wing,[citation needed] is a syndrome that affects primarily aquatic birds, such as geese and ducks, in which the last joint of the wing is twisted with the wing feathers pointing out laterally, instead of lying against the body. Males develop it more frequently than females. It has also been reported in goshawks, bustard chicks, and psittacine birds (budgerigars, macaws, and conures).[2]
Description
The theoretical causes of angel wing are genetics, the excessive intake of carbohydrates[3] and proteins,[1][4] together with insufficient intake of vitamin E,[4] low dietary calcium[1] and manganese deficiency.[1] While there is little direct evidence for a link between the consumption of bread and the development of angel wing[5] some experts and academics deny the connection.[6]
^Zsivanovits, Petra; Monks, Deborah J.; Forbes, Neil A (March 2006). "Bilateral Valgus Deformity of the Distal Wings (Angel Wing) in a Northern Goshawk (Accipiter gentilis)". Journal of Avian Medicine and Surgery. 20 (1): 21–26. doi:10.1647/1082-6742(2006)20[21:BVDOTD]2.0.CO;2.
