Cuvier's beaked whales are usually born weighing about 500 pounds and between 6.8 and slightly over 8 feet long. Calves are black or dark blue with a white belly. Females reach maturity at an average of 19 to 23 feet long and the males at 19 to 22.5 feet, weighing about 2 to 3.5 tons. Cuvier's beaked whale is an odontocete — or