Blue whales have been spotted swimming a few miles off the coast of Los Angeles. Fishermen working in the area say it is the first time they have ever seen the world's largest mammal swimming so close to the shoreline.
Marine biologist Alisa Schulman Janiger estimates that around 200 blue whales are currently in the area. She says an abundance of krill near the shore means the blue whales are swimming closer to land. Sian Williams reports.
Video at link.