These frozen prehistoric animals are superbly well-preserved and now famous around the world.
1. Woolly rhino baby named Sasha(opens in new tab)
This woolly rhino baby (opens in new tab), affectionately named Sasha by the man who found it, was the first young member of its species ever found. It's unclear if it is male or female, but the horn size suggests it had been weaned by the time it died. It roamed the mammoth steppe, a dry, cold region from Spain to Siberia.
Related: See photos of the extinct wooly rhino baby (opens in new tab)
2. Lion or lynx(opens in new tab)
Scientists unearthed a squashed, mummified cat (opens in new tab) in eastern Siberia in 2017. It could either be a lynx kitten or a cave lion cub. Its coat is in beautiful condition, but we can't be sure of the species as we don't really know what a cave lion looked like.
Related: See photos of the mysterious ice age cat mummy (opens in new tab)
3. Mammoth calves(opens in new tab)
Explorers unearthed two mammoth calves dating to about 40,000 years ago in two different areas of Siberia. Researchers took a closer look at the specimens using CT scans (opens in new tab) and discovered that both baby mammoths had choked on mud. The little mammoths appeared otherwise plump and healthy when they met their demise.
Related: See inside the skin and bones of preserved mammoth calves (opens in new tab)
4. Ancient bison(opens in new tab)
The most complete steppe bison specimen (opens in new tab) ever found is 9,000 years old. It has a complete heart, brain and digestive system, along with near-perfect blood vessels. Some organs have shrunk over time but are remarkable, nonetheless.
Related: See photos of the 9,000-year-old bison mummy found in Siberia (opens in new tab)
5. Frozen foal(opens in new tab)
A two-month-old horse (opens in new tab) that died between 30,000 and 40,000 years ago made its way approximately 100 meters (328 feet) below the surface, deep in a Siberian crater. In life, the young horse stood almost 1 m (3 feet) tall, and its hooves are still intact, along with tiny hairs that are still visible inside the foal's nostrils.
Related: See photos of the perfectly preserved ice age foal (opens in new tab)
This article was adapted from a previous version published in How It Works magazine, a Future Ltd. publication. To learn more about the wonders of the natural world, subscribe to How It Works (opens in new tab) magazine.