http://www.coolantarctica.com/Antarctica%20fact%20file/wildlife/whales/whales.php
http://video.nationalgeographic.com/video/whale_killer_hunts_sealion
http://video.nationalgeographic.com/video/orca-juvenile-training-lex
http://video.nationalgeographic.com/video/whale_killer_hunts_sealion
http://video.nationalgeographic.com/video/orca-juvenile-training-lex