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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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Greater Scaup: Large diving duck with glossy green-black head, white sides and belly, black tail, neck and breast, barred gray flanks and back. Eyes are yellow. Bill is blue-gray with a black tip. Feeds on insects, plants, vertebrates and mollusks. Rapid direct flight with strong rapid wing beats.
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