van Loon, Hendrik Willem, 1882-1944, American author and journalist, b. Rotterdam, Netherlands. He emigrated to the United States in 1903 and studied at Harvard and Cornell (B.A., 1905). He was an Associated Press correspondent in Russia during the revolutionary outbreak of 1905 and in Belgium at the beginning of World War I. His numerous popular histories include The Story of Mankind (1921), The Story of the Bible (1923), Tolerance (1925), America (1927), and R. v. R. (1930), a fictional biography of Rembrandt.

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.

or diver

Any of five species (genus Gavia) of diving birds of North America and Eurasia. Loons range in length from 2 to 3 ft (60 to 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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