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The black swallower is a species of deep sea fish known for its ability to swallow meals larger than itself.

Black swallowers have been found to have swallowed fish so large that they could not be digested before decomposition set in, and the resulting release of gases forced the swallower to the ocean surface.

This is, in fact, how most known specimens of this fish came to be collected. This one died trying to eat a fish 4.5 times it’s own size – @wikipedia