Blue whales are the largest animals ever to live on Earth, and 40 years ago they were almost extinct. Now, about 2000 live in the North Pacific Ocean, so it's very rare to see 25 all at once, much less 100. But that's what happened to KCRW's Matt Holzman, sailing yesterday afternoon off Marina del Rey. We hear from him and Michele Sousa, senior marine mammal biologist at the Aquarium of the Pacific.