Aspects of this topic are discussed in the following places at Britannica.
...avosetta) has the crown and hindneck black, the wings black and white. It breeds in central Asia and in scattered localities in Europe. Many winter in Africa’s Rift Valley. The slightly larger American avocet (R. americana), which is about 45 cm (18 inches) long (including the bill), differs chiefly in having the head and neck pinkish brown in breeding season, white in winter. It...
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