carcharadon megladon! Look it up!
some of the most interesting animals on Earth are Star-nosed moles ,tapirs, emperor tamarins, baboons, shoebills, leafy sea dragons, giant pandas and angora rabbits
The Human
What's most interesting about any 'Antarctic animal' is that there are none. Sea birds and sea mammals breed on Antarctica's beaches precisely because there are no land predators on the continent. One breeding sea bird, four types of which are only found in the Southern Ocean, which surrounds Antarctica is a penguin. A fun fact specifically about penguins is that they are among the few birds on Earth that cannot fly. Stranger yet, they are excellent swimmers.
sea urchin
sea lion star fish cat fish whale shark dragon fish
Whale
I think the most interesting (and the saddest) thing is that in most cultures, if someone saves your life, you owe them your life. It's interesting that Travis has to kill the animal that saved his life.
killer whale
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the catfish
the most ancient sea mammal would have to be the flat fish although it is endangered.
An interesting jungle animal would be a panther or a monkey.