. - [jitack] coral reefs are like the cies of the ocean. it's an ecosystem that's all balanced. - [scott] to recreate that balanced ecosystem, all the sea life was carefully selected. the only thing that's not really from the pacific is the coral, it had to be man-made. - coral is actually a living animal. it looks like rock and it's related to jellyfishy so it's basically the outer edge of the coral is living and building on the limestone skeletons of it's ancestors. and the coral in this exhibit however is recreated real coral has to have intense sunlight so it's also very fragile. - you can actually step into the reef at the underwater viewing level. and there's a lot to view. when she was found she had a badly hurt fin. after some delicate surgery, it was decided that calypso wouldn't be able to survive in the ocean. so blacktip reef became her new home. the exhibit also has plenty of sharks. particularly the kind it's named for, the blacktip reef shark, what's called an apex predator. so, what is an apex predator? for example, lions in