Researchers in Costa Rica have unearthed fossils from a mastodon and a giant sloth that lived as many as 40,000 years ago, officials announced Friday, calling it the biggest such find here in decades.

Researchers at the Museo Nacional de Costa Rica have confirmed a major paleontological find in the province of Cartago: fossil remains from a mastodon-like creature and a giant ground sloth. This ...

Handout picture released by Costa Rica’s Ministry of Culture showing archaeologists from the National Museum of Costa Rica taking part in the excavation and recovery of fossil remains of a giant ...

Add Yahoo as a preferred source to see more of our stories on Google. Researchers have so far recovered 49 bone pieces including a femur, vertebrae and ribs from the mastodon and giant sloth (Handout) ...