Physical Description
The finless porpoise almost completely lacks a dorsal fin. Instead there is a low ridge covered in thick denticulated skin.
Adults are a uniform, light grey colour. Newborn calves are mostly black with grey around the dorsal ridge area, becoming fully grey after four to six months. Adults grow more than 1.55 m (5 ft) in length and up to 30–45 kg (65–100 lb) in weight. Males become sexually mature at around four to six years of age, and females at around six to 9 years of age.
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