This superstition about black cats and other black animals in general has shaped people’s preferences about animals. It’s left its mark on things such as lower adoption rates for black cats and ...

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From the fearsome piranha and vampire fish to the mighty anaconda, the crocodile, and the candiru, these are among the most terrifying reptiles, insects, spiders, and fish.

This story appears in the October 2018 issue of National Geographic magazine. Moon jellies, which are found in shallow bays around the world, look like small, not entirely friendly ghosts.