Pollution and being caught in nets during tuna fishing also causes problems. These nets are mainly used in the tropical pacific. These nets take the lives of 120,000 dolphins a year. Drift nets that are around 30,000 miles in length are released at night and are carried along by the current of the ocean, as they are being swept they pick up all the creatures in its path. There are not many things being done to help dolphins, other than some people choose not to eat tuna.
Males reach their sexual maturity at about ten to twelve years.
Females are mainly reponsible for initiating courtship and thier breeding behavior. Dolphins breed throughout the year, but certain seasons have been found in different places. A dolphins baby is called a calf. Along the coast of Florida most of the calves are born around May. Dolphins that are born along the coast of Texas are usually born around March. The dolphins gestation period last around 12 months.