Birds apparently born with one leg.

CN 5041
House Sparrow Passer domesticus male ad
22 April 1990 West Mallorca, Spain
Weight 27.0g, Testes left 9.6 x 7.6, right 9.4 x 8.4
both femur 18.6, but right only ¼ moveable because kept to the caudal ribs by a membrane. Traffic accident.

CN 5095
House Sparrow Passer domesticus male ad
23 April 1994, Mallorca, Spain
Weight 25.7g, Testes left 13.1 x 9,2, right 10.5 x 9.1
Traffic accident. Not depicted.

CN 5717
Motacilla alba male ad
2 May 2004 55.23N 09.28E Taps, Denmark
Weight 20.241g, Testes left 10.0 x 6.4, 0.177g, right 9.0 x 6.4, 0.124g
Femur left 16.66, right femur broken, rest of the leg missing. Traffic accident.

CNS 908
Coturnix chinensis male ad
6 May 2004, dead in captivity
Weight 31.108g, without right tarsus and digits.
Dead in captivity, the aviculturist had not recognised its handicap.