the la plata dolphin has the longest beak (as a proportion of body size) of any cetacean — as much as 15% in older adults. males grow to and females to . the body is a greyish brown colour, with a lighter underside. the flippers are also very large in comparison with body size and are very broad, but narrow on joining the body, so are almost triangular in shape. the trailing edges are serrated. the crescent-shaped blowhole lies just in front of a crease in the neck, giving the impression that dolphin forever has its head cricked upwards. the dorsal fin has a long base and a rounded tip. the la plata dolphin has homodont dentition with conical shaped teeth. the number of teeth range from 48 to 61 on each side of its upper and lower jaw.