They hunt for fish, their main food, in groups. The composition of their diet varies with location and season. How old a dolphin can become is not known exactly, but the maximum age is probably around 35 to 40 years. Females become sexually mature at 6 to 12 years of age. Males mature at 10 to 12 years.
Twins are very rare.
The calf is born underwater, usually tail first. But head first births do occur and can be successful. Once the umbilical cord breaks, the calf swims to the surface for its first breath. Occasionally the mother or another dolphin helps the calf, but usually this is not necessary. After birth, the calf swims in its mother's slip stream by positioning itself near the dorsal fin.