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BiologyHeaviside's dolphins, often seen in small groups of two to ten individuals (2), are not as lively or boisterous as some other dolphins, but nevertheless, have been occasionally seen riding the bow waves of boats (5). They feed on a wide variety of prey found in their coastal habitat, including small schooling fish, fish dwelling on the sea floor, and squid (2). While little is known about the breeding biology of Heaviside's dolphin, it is assumed to be similar to that of closely related species. Males are thought to reach sexual maturity between the age of five and nine years, and females bear their first calf between six and nine years of age. Mating takes place in spring to late summer, and after a gestation period of 10 to 11 months, the calves are born. Mature females are believed to calve every two to four years (2).