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In this Monday, March 7, 2011 photo, killer whale Tilikum, right, watches as SeaWorld Orlando trainers take a break during a training session at the theme park's Shamu Stadium in Orlando, Fla. In an unprecedented lawsuit, People for the Ethical Treatment of Animals is accusing the SeaWorld marine parks of keeping five of its star-performer killer whales in conditions that violate the Constitution's ban on slavery. The suit, which PETA says it will file Wednesday, Oct. 26, 2011 in U.S. District Court in San Diego, hinges on the fact that the 13th Amendment, while prohibiting slavery and involuntary servitude, does not specify that only humans can be victims. (In this Monday, March 7, 2011 photo, killer whale Tilikum, right, watches as SeaWorld Orlando trainers take a break during a training session at the theme park's Shamu Stadium in Orlando, Fla. In an unprecedented lawsuit, People for the Ethical Treatment of Animals is accusing the SeaWorld marine parks of keeping five of its star-performer killer whales in conditions that violate the Constitution's ban on slavery. The suit, which PETA says it will file Wednesday, Oct. 26, 2011 in U.S. District Court in San Diego, hinges on the fact that the 13th Amendment, while prohibiting slavery and involuntary servitude, does not specify that only humans can be victims. (Phelan M. Ebenhack/AP)
In this Monday, March 7, 2011 photo, killer whale Tilikum, right, watches as SeaWorld Orlando trainers take a break during a training session at the theme park's Shamu Stadium in Orlando, Fla. In an unprecedented lawsuit, People for the Ethical Treatment of Animals is accusing the SeaWorld marine parks of keeping five of its star-performer killer whales in conditions that violate the Constitution's ban on slavery. The suit, which PETA says it will file Wednesday, Oct. 26, 2011 in U.S. District Court in San Diego, hinges on the fact that the 13th Amendment, while prohibiting slavery and involuntary servitude, does not specify that only humans can be victims. (In this Monday, March 7, 2011 photo, killer whale Tilikum, right, watches as SeaWorld Orlando trainers take a break during a training session at the theme park's Shamu Stadium in Orlando, Fla. In an unprecedented lawsuit, People for the Ethical Treatment of Animals is accusing the SeaWorld marine parks of keeping five of its star-performer killer whales in conditions that violate the Constitution's ban on slavery. The suit, which PETA says it will file Wednesday, Oct. 26, 2011 in U.S. District Court in San Diego, hinges on the fact that the 13th Amendment, while prohibiting slavery and involuntary servitude, does not specify that only humans can be victims. (Phelan M. Ebenhack/AP)

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Should SeaWorld free the killer whales?

Experts for and against keeping killer whales in captivity debate the ethics behind the issue on CNN's Crossfire.

Should SeaWorld free the killer whales?

Experts for and against keeping killer whales in captivity debate the ethics behind the issue on CNN's Crossfire.