The plumage of adult tundra swans is completely white, though their heads and necks are often stained a rusty color from ferrous minerals encountered in marsh soils during feeding. The bill is black and often has a yellow spot at the base. The legs and feet are black and the iris is dark brown. Both sexes are identical in appearance, but males typically are larger. The tundra swan is smaller than the trumpeter swan, but it is difficult to separate them in the field. The tundra swan’s call is high-pitched and reminiscent of snow geese, while the trumpeter swan’s call is more vociferous and has been likened to the sound of a French horn.
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