Males are slightly smaller.
At birth calves are approximately 15 feet long. Gray whales spend the summer in the Bering, Chukchi, and Beaufort Seas. Gray whales, like other baleen whales, migrate to warmer waters during the winter months. During this annual migration, a gray whale can travel as far as 6,000 miles each way. Pregnant females travel to the lagoons to give birth and raise the calf.