CASARCA.
Much like "Tadorna." Bill less concave ; nail wider and not recurved.
Casarca casarca (L.). RUDDY SHELDRAKE. Ger. Rostente ; Casarca.
Orange brown with black neck ring ; wing coverts and axillaries white ; speculum coppery green ; rump, upper tail coverts, and tail black. Bill, legs and feet black. 9 Paler, whiter on head, and without neck ring. \Ving d 350-399, 9 327-357. Tarsus 55-65. Bill e 42-50, 9 36-47 (\V.).
Breeds.—Balkan Peninsula, Greece, Rumania, Crimea, lakes of S. Russia up to Volga Valley, Caucasus, and through S.W. and C. Asia to China ; also has bred Algeria and probably S. Spain. Occurs in winter N. Africa, India, and S. China. Casual visitor to N. and \V. Europe ; rare wanderer to Britain.