Drone captures rare video of whale swimming with twin babies

SAN FRANCISCO (KGO) -- A drone captured rare video of two little gray whales swimming next to their mom in Southern California.

The twin babies and their mom were spotted by people on a whale-watching boat off Dana Point.

According to the boat captain, it's rare to see a gray whale with two calves. Usually there's just one baby.

He says this is something he has never seen before.