These animals, known as sea pigs, are in fact a type of sea cucumber. Sea pigs are found in the deepest abyssal depths of the world’s oceans, as far as 3.7 miles under the ocean surface. They are known to eat bits of decaying plant and animal material found in deep sea mud, but are awfully fond of food that has recently fallen from the ocean’s surface, like a whale corpse!
For instance, in 2015 researchers identified a ruby-red sea dragon off the coast of Australia, a new species of giant tortoise in the Galápagos Islands and an ancient spikey worm with 30 legs in China. As these newfound creatures are uncovered, it's important to protect them from pollution, habitat loss and the havoc caused by invasive species, especially as Earth enters its sixth mass extinction, experts say.