The Sea Anemone: The lowly sea anemone doesn't look like an immortal animal. In fact, it doesn't even look like an animal. In between swaying to the left, swaying to the right, and occasionally swallowing a bit of debris, this brainless polyp is busy defying everything we know about mortality. A sea anemone doesn't age as it gets older; it simply grows bigger. Fortunately for those who find this a little creepy, none of them have lived long enough to develop sentience yet-- they get wiped out at around age 80 by heat, water pollution, infections and greedy collectors.
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