A young whale is called a calf. The female whale is known as a cow, while the male is known as a bull. The gestation period of a whale can last from 9 to 18 months. The calf suckles from 6 months to 2 years before becoming an adult.
Being a mammal, the female whale carries offspring in her womb. She gives birth every 1 to 6 years. Whales may migrate thousands of miles from their feeding ground to mate. Bulls compete for the right to mate with the female, performing amazing acrobatic feats during the challenges. Whales are not monogamous, and the female may mate with several males during a single season.