range in length from 2 to 3 ft (60–90 cm). They have small pointed wings, webs between the front three toes, legs placed far back on the body, making walking awkward, and thick plumage that is mainly black or gray above and white below. They feed mainly on fishes, crustaceans, and insects. Almost wholly aquatic, they can swim long distances underwater and can dive to a depth of 200 ft (60 m). They are generally found singly or in pairs, but some species winter or migrate in flocks. They are known for their eerie, “laughing” cries.

 found in most tropical and temperate areas and often in subarctic regions.

Most species can fly, and some are migratory. Grebes have a pointed bill, short narrow wings, and a vestigial tail. The position of their legs, set at the rear of the body, makes walking awkward. They feed chiefly on fish or invertebrates. Courting or rival males perform elaborate aquatic dances in pairs. Species range from about 8 to 29 in. (21–73 cm) long.