Some extinctions feel final, but history has shown that species can vanish for decades - even centuries - before resurfacing when conditions are right. Using the best available evidence, we rank ...

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

Handout picture released by Costa Rica's Ministry of Culture showing archaeologists from the National Museum of Costa Rica ...

The conservation value of de-extinction lies not in populating landscapes with proxy extinct animals, but in developing technologies that address today's biodiversity crisis.

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

Sloth photos used to be marketed as harmless bucket-list moments. That framing is changing fast. Wildlife agencies and tourism boards are putting clearer limits on handling, and Costa Rica’s own ...

It’s not considered polite to talk about it, but we all do it. Some of us are in and out so quickly that nobody would even ...

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

Radio host and former JLS singer Marvin Humes has been unmasked as Can of Worms on The Masked Singer, becoming the second contestant to be eliminated from the semi-final. The 40-year-old departed the ...

The sloth is a tropical mammal that lives much of its life hanging upside-down from tree branches. When obliged to descend to the ground, sloths crawl along a level surface at the rate of ten feet a ...

Sloths appear to have life figured out, and once the details are revealed, being envious makes sense. These tree-dwelling mammals have survived for millions of years by doing things their own way, and ...

A new discovery in Uruguay has possibly pushed the earliest evidence for human presence in South America back by thousands of years. Scientists studying a 33,000-year-old heel bone from a giant ground ...