The Promachoteuthis sulcus is a deep-sea squid with human-like "teeth" that are lips covering its beak, giving them an eerie appearance. The star-nosed mole is a bizarre, tentacled nose with ...

From slithering snakes and lurking bats to sneaky hyenas and “scary” sharks, many animals suffer from a bad reputation—but the truth behind their behavior might just change how you see them. These ...

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.