Earth is crawling with lifeforms, and most of them are unknown to us humans.
A 2011 study estimated that scientists had not yet identified 86% of species on Earth, and 91% of ocean species. Scientists chip away at that number every year, traveling to remote mountain forests and the deepest regions of the seas to catalogue new animals.
They've uncovered bizarre creatures in extreme environments and unknown mammals hiding in plain sight.
Here are 14 fascinating animals that scientists found in the last decade.
Earth is home to an estimated 8.7 million species, though the vast majority remain undiscovered. In the last decade, scientists have found some surprising creatures.
The olinguito is the first carnivore discovered in the Western Hemisphere since the 1970s.
In 2017, a giant rat fell from a tree, straight into the hands of a mammologist who knew he'd found something new.
Another adorable tree-dweller, the dwarf lemur, is smaller than a squirrel.
Other newly discovered tree creatures aren't as cute and cuddly. This Phuket Horned Tree Agamid was found in Phuket, Thailand.
A tiny frog smaller than a dime, discovered in 2012 in the rainforests of New Guinea, is the world's tiniest vertebrate.
Through DNA testing, scientists discovered a new species of pink river dolphin in the Amazon's Araguaia river basin.
The fire-tailed titi monkey and a honeycomb-patterned stingray were among a same batch of 381 new species discovered in the Amazon rainforest.
On the other side of the world, in the forests of Vietnam, cameras spotted this long-lost mouse deer in November.
Researchers who discovered this African fish with gleaming purple scales named it after Wakanda, the fictional home of Marvel's Black Panther.
The deepest reaches of the ocean harbor all kinds of strange, unknown creatures. The last decade of deep-sea exploration has revealed several of them.
In one of the world's deepest cave systems, scientists spotted a new, translucent snail.