In flight, the rhythmic flapping of the swan's wings produces a tone that once earned it the name "whistling swan." These large birds feed by dipping their heads underwater to pluck aquatic plants ...

the mute swan and the tundra swan (sometimes known as the whistling swan). Trumpeter swans almost went extinct during the early 1900s—fewer than 100 were in the Lower 48 at one point.

Peter Ilich Tchaikovsky did not, after all, write Duck Pond. The whooper swan, like its onomatopoeic cousins, the whistling and the trumpeter, belongs to an elegant society of sisters; the mute ...