Grey whale, calf swim together in Monterey Bay

MONTEREY, Calif. (KGO) -- Gray whales have started migrating south, along our coast. A drone has captured incredible images of a calf, swimming alongside its mother.

The Monterey Bay Whale Watch provided this rare sight.

VIDEO: Whale breaches with spectacular rainbow in Monterey Bay

Gray whales are being attracted to Monterey Bay on their migration because of an abundance of squid, which provide plenty of food.

A marine biologist says warmer waters in Mexico give the whales a safe place to give birth and nurse their calves.

The whales will return to Alaska in the spring.

See more stories, photos, and videos on whales.