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Trumpeter Swan: Largest swan in the world, completely white but with head and neck often stained rust-brown from contact with ferrous minerals in wetland soils. Bill, legs, and feet are black. Feeds on aquatic plants. Strong direct flight on steady wing beats. Flies in straight line or V formation.
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Mute Swan: Aggressive bird, entirely white, orange bill with large black basal knob and naked black lores. Curved neck is often stained with pigments from iron or algae. Legs and feet are black. Feeds on aquatic plants collected from bottom. Direct flight with strong steady wing beats.
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