Both, the Short-beaked Common Dolphin and the Long-beaked Common Dolphin are medium-sized dolphins. Adults grow between the lengths of 1.9 to 2.5 meters (6.2 to 8.2 ft), and weigh around 80 to 235 kg (180 to 520 lb). Males are longer and heavier than females. They are dark grey on the back, the belly is white, and the sides are light grey, gold, or yellow in color. 