AquaticLiving in or on water. Most aquatic birds show some kind of adaptation to their environment, notably lobing or webbing of the feet, as found respectively in the grebes (family Podicipedidae) and the gulls (family Laridae). In addition to the truly aquatic (swimming) birds, there are many riparian types.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver