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After attracting hungry, larger animals with its bioluminescent belly, the cookiecutter shark spins around and takes a bite out of them instead. These sharks have even attacked nuclear submarines, causing enough damage to merit a return to port.
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The cookiecutter shark is classified as a parasite. 00:03
The cookiecutter shark attracts prey with its bioluminescent stomach. 01:07
Cookiecutter sharks leave their telltale circular marks on seals, whales, dolphins, other sharks, and even submarines. 01:42
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