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"In ornithology, pinnatiped; having pinnate feet, the toes being separately furnished with flaps, as in the grebes, coots, phalaropes, fin-foots, etc." -Whitney, 1911

Fin-Footed Coot Foot

"In ornithology, pinnatiped; having pinnate feet, the toes being separately furnished with flaps, as…

Expert swimmers, grebes hunt fish, frogs, crustaceans, and insects in both salt and fresh water.

Grebes

Expert swimmers, grebes hunt fish, frogs, crustaceans, and insects in both salt and fresh water.