Researchers in Costa Rica have unearthed fossils from a mastodon and a giant sloth that lived as many as 40,000 years ago, ...

Before leaving on a fossil-hunting trip for a summer 2021 field paleontology class, a Montana State University junior made an ...

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SAN JOSE, Costa Rica — 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 ...