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. The "amazing discovery" of a sloth's hip bone and a fragment of a bison's radius bone was made about 16ft (5m) below ground in Park Mesa Heights.
Scientists say the Harlan's Ground Sloth could have weighed 1,500lb (680kg), and been up to 10ft in length. The sloth and bison species have been extinct for at least 10,000 years.
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