List of captive orcas (read about Tilikum, the orca involved in the attack that killed a trainer at Sea World Orlando, FL on 2-24-10)

http://en.wikipedia.org/wiki/Kayla_(whale)#Tilikum

another link and possible reason for Tilikum's attack...
http://www.msnbc.msn.com/id/35584261

and another link
http://www.slate.com/id/2246027/