Researchers in Costa Rica have uncovered ancient mastodon and giant sloth fossils, shedding light on the prehistoric giants that once roamed the region.

Costa Rica's Museo Nacional announces a groundbreaking fossil discovery in Cartago, including remains of a mastodon-like ...

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 ...

Hidden beneath the bright dunes of White Sands and the dry flats of the Utah desert, ancient human footprints have been lifted out of the sand and into one of archaeology’s fiercest debates. Pressed ...

In a study based on a Judith Gap-area bison kill site, scientists utilized detailed soil samples to gain insight to what may ...

Long before today’s tree-dwelling sloths, a 4-ton giant roamed South America — and it may have stood and fought like a bear.

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.

In a study based on a Judith Gap-area bison kill site, scientists utilized detailed soil samples to gain insight to what may have led Native Americans to abandon the location.

Why did mammoths and other contemporary mammals disappear? Throughout its eventful existence, Earth has experienced five ...

While sharks may have emerged before trees, it’s the latter that holds the title of the longest-living organisms. The oldest-known, still-living, individual tree is a 4,857-year-old Californian ...