an English three-masted man-of-war famous chiefly for its expedition around the world in 1831–36 under the command of Robert Fitzroy, with the participation of C. Darwin.
The Beagle’s displacement was 235 tons. Biological and geological research was carried out on the Beagle, including studies of the structure of coral reefs, volcanic islands, and other phenomena. On missions for the British Admiralty from 1826 to 1830,1831 to 1836,1837 to 1841, and 1841 to 1843, the Beagle conducted hydrographic studies for a survey of the coasts of South America, New Zealand, and northern Australia.