Blue whales have been spotted off the coast of San Diego.
According to NOAA, they're a bit early, as they usually arrive in June and stay until early July. Experts say they are migrating North from Mexico and South America and looking for krill to eat.
They won't be hard to miss. They are the length of three school busses, weigh up to 300-thousand pounds, and yes, are the largest mammals on the planet.