Behaviour and Reproduction
Like other porpoises, their behaviour tends to be not as energetic and showy as that of dolphins. They do not ride bow waves, and in some areas appear to be shy of boats. In the Yangtze River, finless porpoises are known to leap from the water and perform "tail stands". Breeding occurs in late spring and early summer, after a gestation period of 10–11 months. The calf clings to the denticulated area of skin on their mother's back and is carried by her as she swims. Calves are weaned at 6–15 months.
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