Some are simple shafts while others are complicated works of underground engineering, with branching passages that twist and turn to form networks—the longest stretching 130 feet from end to end. In fact they're estimated to be at least 8,000 to 10,000 years old. They weighed more than an adult elephant. They weighed more than an adult elephant. But despite these creatures stretching up to 4.6 metres (15 feet) and weighing roughly 2,590 kg (5,709 pounds), a single ground sloth would have spent much of its lifespan dedicated entirely to constructing tunnels as large and extensive as the palaeoburrows are. These tunnels are impressive, some are over 2 m (6.5 ft.) wide, 1.5 m (5 ft.) high and up to 30 m (100 ft.) long. Scientists believe they either were dug by ancient giant sloths or ancient armadillos. The Metropolitan Transportation Authority says a fossilized hip joint was discovered on May 16 in a layer of sandy clay 16 feet below a major thoroughfare where the new rail line is being built. The fossilized remains of 22 Ice Age, elephant sized sloths have been found preserved in 20,000-year-old asphalt in Ecuador. The sloth remains included a 27,000-year-old tooth, arm bone, and leg bone. LOS ANGELES (AP) — Crews digging a tunnel for a new Los Angeles train line have found the remains of an ancient giant sloth. LOS ANGELES (AP) — Crews digging a tunnel for a new Los Angeles train line have found the remains of an ancient giant sloth. These large, furry herbivores lived for about 5.3 million years and went into […] Image: S. Rae/Flickr. The one competing source of tunneling was likely another Ice Age giant, the Holmesina armadillo. (Credit: Wikimedia Commons) ( Image Source ) According to Frank, the mega tunnels measuring upto 5 feet in diameter, were dug by ground sloths. And no one's sure why they dug them. Some are simple shafts while others are complicated works of underground engineering, with branching passages that twist and turn to form networks—the longest stretching 130 feet from end to end. Moreover, the sheer size of the tunnels cannot possibly be made by any “giant” armadillos or sloths – at least, ones that we know of. Tunnels excavated by giant sloths in ancient South America still exist today. Ancient, giant sloths are the prime suspect behind the creation of these paleoburrows." The Giant Ground Sloth, also known as the Megatherium, was a genus of enormous rhino-sized ground sloths (as opposed to the modern-day tiny tree sloths) that were indigenous to South America and migrated and spread across the entire continent of North America. Crews digging a tunnel for a new Los Angeles train line have found the remains of an ancient giant sloth. Ancient sloths dug Brazil’s giant tunnels. The sloth remains included a 27,000-year-old tooth, arm bone, and leg bone. Now scientists have concluded that an ancient species of giant sloth excavated the tunnels. The discovery of this giant sloth death pit is revealing a virtual Bible of new evolutionary facts. Previous ideas about the tunnels have included everything from mythical monsters to ancient lava tubes, but none of hold up against the handy-work of a huge ground sloth. Giant ground sloths like Eremotherium were built for burrowing. His specialty are the Giant Sloth tunnels of which he has found many, though most belong to extinct giant armadillos, some are too large to have been dug out by them, and must have been excavated by giant sloths. LOS ANGELES — Crews digging a tunnel for a new Los Angeles train line have found the remains of an ancient giant sloth. In South America, giant sloths—some the size of elephants—roamed the surface, and were, perhaps, expert tunnel diggers. American ground sloths from the extinct Lestodon genus. A sloth bone found by crews digging a tunnel for a new Los Angeles train line appears to be the remains of an ancient giant sloth. Gideon Long, Santiago. For the first time in thousands of years, sacred Mayan underwater tunnels in Mexico's Yucatan are being rediscovered, say researchers from Mexico's National Anthropology and History Institute (INAH). Massive caves in southern Brazil are actually ancient ground sloth burrows Usually, tunnels are made either by human engineers or flowing water. LOS ANGELES (AP) — Crews digging a tunnel for a new Los Angeles train line have found the remains of an ancient giant sloth. Don’t ever call sloths lazy again. Tags biology extinct animal giant sloth mammals natural world prehistoric creature prehistoric mammal Science Crews digging a tunnel for a new Los Angeles train line have found the remains of an ancient giant sloth whose species grew up to 10 feet in length and weighed up to 1,500 pounds. And yeah they argue a bit about what kind of animal it could be. April 20, 2017. The giant armadillo, the largest existing member of its family, weighs between 65 and 90 pounds and is native to South America. These giant sloths went extinct between 14,000 and 10,000 years ago. Little was known about the sloth-dug tunnels before this point and since their initial discovery, Frank and his team of researchers have found more than 1,500 tunnels in Rio Grande do Sul area alone. “The biggest giant armadillo had a body width of 80 centimeters, while the tunnels reach widths of 1.4 meters and in addition, the ceiling is full of scratches “I personally believe they were excavated by land sloths, a group of mammals that became extinct in that area about 10,000 years ago,” says Frank. "Thankfully, a glance at the walls quickly clears the mystery - massive claw marks line the walls and ceilings of the tunnels. Fossils found by workers digging a tunnel for a new railway line in Los Angeles have been identified as the remains of a giant sloth and a bison. http://undergroundworldnews.comDeep inside Brazil, there are tunnels large enough for a person to walk through. There are thousands of huge tunnels in the northern part of South America. 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