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We’ve all come across those documentaries where archaeologists gently use tiny brushes to sweep away dirt from the remains of long-gone creatures. Uncovering fragile traces of extinct animals is common in this field. But now and then, researchers come across remains that are so impeccably preserved, they stand out in their own right.
10. Yuka the Woolly Mammoth
While researchers have uncovered several well-preserved woolly mammoth specimens, Yuka stands out as the most astonishingly preserved to date. This 1.8-meter (6 ft) baby woolly mammoth was accidentally found in August 2010 in Yakutia, a remote part of Siberia.
The mammoth was between six and nine years old at the time of its death, and its remains are estimated to be around 39,000 years old. Experts believe Yuka was likely killed by humans, as signs of cutting were found on the remains. This makes Yuka the first woolly mammoth with evidence of human interaction (though it didn’t end well for the mammoth). Additionally, Yuka has the most perfectly preserved woolly mammoth brain ever discovered, with its folds and blood vessels still intact.
Yuka is so remarkably well-preserved that scientists are seriously considering using her DNA to attempt cloning the species back into existence. One wonders if the researchers took any lessons from Jurassic Park.
9. Trilobites
Don’t be deceived by their roly-poly look—trilobites were actually highly effective predators in their era. These marine arthropods roamed the Earth as early as 521 million years ago, during the Cambrian period.
Trilobite fossils can be found across all continents, with some of the best-preserved specimens still showing soft body parts like antennae and gills. They went extinct around 250 million years ago during the Permian period's mass extinction event. With a lineage spanning more than 300 million years and over 20,000 species, trilobites are regarded as the most successful animal of all time.
8. Rhino-Like Dinosaur
The remarkably well-preserved remains of a baby Chasmosaurus belli (the charming relative of the triceratops) were uncovered in Alberta, Canada, in 2015. A paper published in 2016 revealed that the baby dinosaur’s body was 75 million years old and mostly intact.
Some of the creature’s skin even left a distinct impression in the surrounding rock. The discovery of the baby Chasmosaurus was a major boon for researchers, as it’s exceedingly rare to find a baby specimen of this species that hasn’t been consumed or destroyed.
7. Woolly Rhinoceros
The 10,000-year-old remains of a woolly rhinoceros were discovered along a frozen riverbank in Yakutia, Siberia. The rhino was named Sasha after the hunter who found it. At the time of its death, Sasha was only a three- to four-year-old calf, making it the only complete baby woolly rhino ever discovered.
While researchers have uncovered well-preserved adult specimens of the species, finding young ones has always been more of a challenge. Sasha was donated to the Yakutian Academy of Sciences in Russia for further study. Although the woolly rhino and the woolly mammoth lived in the same period and even shared a habitat, they are not closely related. The woolly rhino is a distant relative of modern rhinoceroses, while the woolly mammoth is related to the modern Asian elephant.
6. Cave Lion Cubs
It seems Yakutia is the place for finding animal mummies (just in case you’re looking for one). A pair of 10,000-year-old cave lion cubs were also found in the region within a Siberian ice sheet. The cubs, named Dina and Uyan, were only about a week old when they perished. Experts believe they were trapped in their den by a landslide, and the lack of air in the den helped preserve their bodies.
Panthera spelaea was first documented in 1810, and until this remarkable find, archaeologists had to rely on bones and animal tracks. These remains are the best-preserved ever discovered, with both the organs and fur still intact.
5. Ancient Horse Fetus
In 2000, remains of the ancient horse ancestor Eurohippus messelensis were found at the Messel Pit archaeological site near Darmstadt, Germany. The horse, which had been in the final stages of pregnancy when it died around 48 million years ago, had a fetus inside that was exceptionally well preserved.
Researchers employed high-resolution micro X-ray imaging and scanning electron microscopy to thoroughly study the fetus. They found that its placenta, internal organs, and even the contents of its stomach were preserved. To this day, it remains the earliest and best-preserved fossil specimen of its kind. The ancient horse was about the size of a modern fox and had four toes on each of its feet.
4. Bison Mummy
The mummified remains of Bison priscus, an ancient ancestor of the modern bison, were discovered by a tribe in Siberia’s Yana-Indigirka Lowland. The freezing temperatures of northern Siberia preserved the bison, keeping its brain and internal organs almost perfectly intact even after 10,000 years.
Olga Potapova, the curator and manager at the Mammoth Site of Hot Springs in South Dakota, assisted in examining the ancient remains. She explained to Live Science that finding intact specimens in Siberia and North America is rare. Typically, these remains are “partly eaten or destroyed” after being preserved in permafrost for tens of thousands of years.
3. The Moa Claw
The moa (scientific name Megalapteryx) was a flightless, wingless bird native to New Zealand. The upland moa was entirely covered in feathers, except for its beak and feet. These massive birds, once the largest in the world, likely avoided being bullied by other animals thanks to their size, despite their quirky appearance.
Research indicates that moa first appeared around 15.8 million years ago. These massive herbivores were New Zealand's largest and most dominant species, thriving until the arrival of Polynesians in the 13th century. Before humans arrived, their only predator was the Haast’s eagle. Over-hunting led to their extinction about 500 years ago, around 1500.
During an expedition in New Zealand's Mount Owen cave system, archaeologists stumbled upon the mummified claw of an upland moa, still holding onto its muscles and skin. After analyzing it, they were astonished to learn that it was 3,300 years old. The moa's extinction was one of the fastest on record, with all nine species vanishing in less than 100 years after the Maori arrived. Due to their flightlessness and slow maturation, the moa couldn't reproduce fast enough to withstand the Maoris' hunting efforts.
2. Dunkleosteus
Dunkleosteus is the most terrifying prehistoric fish you've probably never heard of. These heavily armored creatures were widespread in shallow seas around the world 380 million years ago. Typically reaching lengths of 9 meters (30 feet) and weighing up to four tons, they were the largest vertebrates of their time. Today, their remains are commonly found across land, including in California, Pennsylvania, Ohio, and Texas.
The head of a Dunkleosteus skeleton often resembles that of an extremely upset leatherback turtle, as both creatures share a similar pair of blade-like jaws. Thanks to their heavily armored skin, the remains of Dunkleosteus have been exceptionally well-preserved over millions of years.
1. The Tumat Dog
Typically, when you ask a dog to “stay,” you don’t expect them to remain still for over 12,000 years. But that's exactly what happened with this dog, discovered by brothers Yuri and Igor Gorokhov on the banks of Siberia’s Syallakh River while they were hunting for woolly mammoth tusks.
The canine is estimated to be approximately 12,400 years old. For the last four years, experts have been studying the body, known as the Tumat dog. However, a thorough necropsy wasn’t performed until 2015. The dog’s organs were exceptionally well-preserved, making it the most complete ancient dog body ever found.
