Blue whales are the largest animals ever known, reaching up to 100 feet long and weighing up to 200 tons. They eat 4 tons of krill per day. Killer whales are the largest dolphins, though endangered off the coasts of Oregon, Washington and California. Beluga whales live in social pods of around a dozen members that can grow to hundreds of individuals. Shamu was the first orca to survive over 13 months in captivity and was the star performer at SeaWorld San Diego in the 1960s-1970s, continuing to be used in shows after her death in 1971.