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BiologyLittle is known of the reproductive habits of the tucuxi dolphin. The freshwater subspecies calves during the low water period of October and November (2), after an 11 to 12 month gestation. It is thought to be polyandrous (where each female has more than one male partner), and aggression between males is seen during courtship (5). The seasonal fluctuation in river water levels has a great influence on the freshwater subspecies. It enters lakes during high water but leaves as the waters begin to fall to avoid being trapped (2). A shy dolphin, the tucuxi tends to be most active during the early morning and late afternoon, but is usually a slow swimmer that jumps infrequently (5). It dives for around 30 seconds (4), and uses echolocation to communicate as well as to catch fish and shrimp (5). Group size varies, but can be up to 20 in freshwater or 50 in the marine subspecies (3).