Notes:
found in shallow coastal waters, estuaries and marshes of South America; in these and other swans, males are called "cobs, females "pens', and the young are called "cygnets".
black head and long black neck; white body (Zoo; 2011-11-20)
pair; knobs at base of pinkish bill (Zoo; 2011-11-20)
pinkish legs and feet (Zoo; 2011-11-20)
small white stripe above eye (Zoo; 2011-11-20)
gracefully curved neck when swimming (Zoo; 2008-11-30)
gracefully curved neck when sitting (Zoo; 2008-12-06)
red knobs at base of bill can be rather grotesque (Zoo; 2008-09-18)