Fin Whales, Once Rare, Crowd Calif. Coast

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From CBS News:

(CBS) Tracking a mystery, Alisa Schulman-Janiger and other marine biologists follow an ocean footprint looking for the second largest mammal in the world, the fin whale.

Sightings of the fin whale - part of the family that includes the humpback and big blue whales - used to be a rarity in the Santa Monica Bay but not anymore. They're everywhere, reports CBS News Correspondent Sandra Hughes.

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