loon

loon, common name for migratory aquatic birds found in fresh- and saltwater in the colder parts of the Northern Hemisphere. Its strange, laughing call carries for great distances. Like the grebes, loons float low in the water and their legs are placed far back. They are expert swimmers and divers, sometimes slipping below the surface to swim underwater, but they cannot walk on land and at nesting time must use bill and wings to inch along. In taking flight they patter across the water with their feet. Their long, sharp, strong beaks are well adapted for catching fish. North American species include the common loon, or great northern diver (Gavia immer), a black and white bird about 32 in. (80 cm) long; the red-throated loon (G. stellata); and the Arctic loon (G. arctica). Loons are classified in the phylum Chordata, subphylum Vertebrata, class Aves, order Gaviiformes, family Gaviidae.

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loon

 or diver

Common loon, or great northern diver (Gavia immer)

(credit: Wayne Lankinen—Bruce Coleman Ltd.)

Any of four species (genus Gavia) of diving birds of North America and Eurasia. Loons 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.

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loon¹

the US and Canadian name for diver (the bird)

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loon²

Archaic a person of low rank or occupation (esp in the phrase lord and loon)

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loon [lün]

(vertebrate zoology)

The common name for birds composing the family Gaviidae, all of which are fish-eating diving birds.