Dolphins mate in the spring and early summer.
Male dolphins are called bulls. Female dolphins are called cows.
The pregnancy period last from 10-12 months for the most of the species of dolphins.
Female dolphins give birth to one baby called a calf. One or more female dolphins may help the mother during the birth.
The calf is born tailfirst and swims to sufrace and with mother's help for its first breath of air. The newborn is third as long as its mother.
Female dolphins have glands to produce milk. The females nurse and protect the young for a year or more. The male doesn'tcare for the young.
Most dolphins live up to 25 years of age. Pilot whales live up to 50 years of age.
Sharks are the natural enemis of dolphins.
Hydrophone is how a scientist records how dolphins communicate with each other through a series of clicks and whistles.
