Mute Swan, Cygnus olor, with young swans (cygnets) swimming in L'Etang de Bolmon, France. These swans are native to Europe and Asia but have been introduced into North America. They can be recognized by the large black knob on the top of their beak. Adult males run 25 to 30 pounds, being one of the heaviest flying birds (and one of the largest water birds as well). This pair (the male, with the larger knob on its beak, on the left, and the female on the right) was shielding their cygnets from the wind on a particularly gusty day.
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