g and 23.5 cm, to the great grebe (Podiceps major), at 1.7 kg and 71 cm. Despite these size differences, grebes are a homogeneous family of waterbirds with very few or slight differences among the genera.

Anatomy and physiology

On the surface of the water, they swim low with just the head and neck exposed. All species have lobed toes and are excellent swimmers and divers. The feet are always large, with broad lobes on the toes and small webs connecting the front three toes. The hind toe also

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