The "unicorns" apparently traveled the earth once, but they looked more like rhinos than horses.
Researchers are learning more about rhinoceroses called "Siberian unicorns" after fossil DNA tests have shed light on their extinction. Palaeontologists say that they existed much longer than expected, and that they lived up to at least 39,000 years old. This means that animals lived among humans.
It was thought that they had died out between 100,000 and 200,000 years ago.
The study also says that Elasmotherium sibiricum probably gone because climate change has destroyed their grasslands and their food source, not because of man.
The team's research was published in the journal Nature Ecology and Evolution.
Various fossils and dinosaur skeletons
The Titanosaur, the largest dinosaur ever exhibited at the American Museum of Natural History, is unveiled at a press conference on January 14, 2016 in New York. The dinosaur was discovered in 2014, in the region Argentinas Patagonia. / AFP / DON EMMERT (Photo credit must match DON EMMERT / AFP / Getty Images)
JOHANNESBURG, SOUTH AFRICA, NOVEMBER 10 (SOUTH AFRICA): Some of the newly discovered fossils discovered at the Institute of Evolution Studies on November 10, 2015 in Johannesburg, South Africa. Dr. Jonah Choiniere, principal investigator of this institution, will announce the latest discovery of a fossil suspected of belonging to a 200 million year old dinosaur discovered in the Karoo Basin. (Photo by Simone Kley / Foto24 / Gallo Images / Getty Images)
TRENTON, CANADA SEPTEMBER 29: The Wankel Tyrannosaurus Rex portrayed standing 12 feet tall devouring a triceratops is a work in progress at Research Casting International, Trenton, Canada on Tuesday, September 29, 2015. The installation will be part mistress exhibition at the Smithsonian National Museum of American History during the reopening of the Fossil Hall in 2019. (Photo by Nikki Kahn / The Washington Post via Getty Images)
TORONTO, ONTARIO, CANADA – 2015/08/21: Close-up of the skeleton of a dinosaur exhibited at the Royal Museum of Ontario. The Royal Ontario Museum is a museum of art, world culture and natural history located in Toronto, Canada. It is one of the largest museums in North America and attracts over a million visitors each year. (Photo by Roberto Machado Noa / LightRocket via Getty Images)
This photo taken on July 28, 2015 on the archaeological site of Angeac-Charente, in the south-west of France, shows fossilized dinosaur bones during their process of unearthing, a Sauropod dinosaur femur ( R) and an Ornithomimosaurus (ostrich dinosaur), a new dinosaur species identified on the site, where at least 43 specimens have been inventoried) dinosaur shin (still in a clay matrix). The Angeac dinosaur fossils deposit is unique in France by its abundance; Of the thousands of fossils discovered there, two species until then unknown were identified. AFP PHOTO / THIBAUD MORITZ (Photo credit: Thibaud MORITZ / AFP / Getty Images)
TORONTO, ON – JUNE 2: A fossil cast of an Archeopteryx lithographica, which lived in the Upper Jurassic, 148 million years ago. A new study suggests that feathers were less common among dinosaurs than previously thought. Interview with Dr. David Evans, ROM, about his new research that could upset the way we imagine dinosaurs. (Bernard Weil / The Toronto Star via Getty Images)
A staff member poses on December 3, 2014 near the world's most complete Stegosaurus skeleton at the Natural History Museum in London. The fossil is 560 cm long and 290 cm high and contains more than 300 bones. AFP PHOTO / JUSTIN TALLIS (Photo credit must match JUSTIN TALLIS / AFP / Getty Images)
The photo taken on July 29, 2014 shows the phalanx of a Sauropoda dinosaur of a length of 34 cm discovered during excavations in Angeac-Charente, in the center-west of France. A paleontology student discovered the fossil on July 25th. The largest thigh bone Sauropoda in the world was discovered on this site in the summer of 2010. The site was discovered in 2008 and has been the subject of active research since January 2010. AFP PHOTO / JEAN PIERRE MULLER (Photo credit should read JEAN PIERRE MULLER / AFP / Getty Images)
7.5-inch solid resin molded from a Giganotosaurus dinosaur tooth, the U-shaped groove located along the tooth shank is where the replacement tooth is located. is developed. (Photo by: Independent Picture Service / UIG via Getty Images)
Fossilized skull of a Pachycephalosaurus wyomingensis, lizard with a thick head, Cretaceous dinosaur. (Photo by: Education Images / UIG via Getty Images)
USA – MARCH 15: Dinosaur fossils preserved in rock, dinosaur quarry, National Dinosaur Monument, Utah-Colorado, United States of America. Detail. (Photo by DeAgostini / Getty Images)
LAS VEGAS – SEPTEMBER 30: One of the world's largest sets of shark jaws including about 180 fossil teeth of the prehistoric species, Carcharocles megalodon, which has reached the size of a school bus, is featured on Venetian Resort Hotel Casino on September 30, 2009 in Las Vegas, Nevada. Bonhams & Butterfields auctioneers hope the fossil will cost between $ 900,000 and $ 1.2 million when it will be auctioned Oct. 3 at Venetian as part of their natural history auction. The centerpiece of the 50 auctioned fossil lot is a 66 million year old Tyrannosaurus rex skeleton, nicknamed "Samson". The female dinosaur fossil of a length of 15 meters, discovered in South Dakota in 1992, contains about 170 bones and would be the third most complete T. rex skeleton ever discovered. Bonhams & Butterfields hopes Samson will bring over $ 6 million to the auction. (Photo by Ethan Miller / Getty Images)
Dinosaur footprint in the rock, Otjihaenamaparero, Namibia, Africa (Photo by Hoberman Collection / UIG via Getty Images)
UNSPECIFIED – 14 August: Mongolia, Gobi desert, Bayanzag valley, fossilized dinosaur egg in the desert (photo by DEA / CHRISTIAN RICCI / De Agostini / Getty Images)
NEW YORK – MAY 10: A fossil of a microraptor from a 130 million year old forest that existed in present-day Liaoning Province, China, is presented to the new exhibition "Dinosaurs: Ancient Fossils, New Discoveries" at the American Museum of Nature History May 10, 2005 in New York. The exhibition, which will be open to the public on May 14 and will run until January 8, uses fossil discoveries, computer simulations and recent life-size models to trace changes in the design of biology. dinosaurs in the last two decades. (Photo by Spencer Platt / Getty Images)
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