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

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.

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 ...

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

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

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 ...

The world’s largest palaeoburrow is located in the Amazon Rainforest and is so long it’d take you roughly 20 minutes to walk ...

Humans are making the world’s wildlife dangerously 'samey'. Some scientists have a word for this reshuffling of life: the ...

This tier list analyzes the largest and most formidable ice age animals by comparing traits like predatory strategy, physical defenses, and biomechanical adaptations. Predators such as saber-tooth ...

Some tropical land regions may warm more dramatically than previously predicted, as climate change progresses, according to a ...