Long before the Great Lakes came to define the heart of North America, a much larger lake once ruled the land. Lake Agassiz, a prehistoric inland sea, spread across the continent with a reach that ...

Smithsonian contributing writer Michael Ray Taylor about what rappelling into Natural Trap Cave reveals about its contents ...

Ichthyosaurs — or "fish lizards" — migrated across the Pacific Ocean between North America and China ... For more information about prehistoric animals that lived in Northern California ...

Here's a look at 15 extinct animals from the last North American ice age, and what scientists know about their lives. Compared with today's coyotes, the Pleistocene coyote had a thicker ...

North America used to be crawling with giant ... Giant sloths Related stories For most extinct Pleistocene megafauna — animals weighing more than 100 pounds — there are still living analogs.

If Yellowstone is dangerous now, it’s a cakewalk compared to the Pleistocene age where humans had to contend with mammoths, ...

A prehistoric sea monster never-before-known to man was hunting prey in North America 85 million years ago, fossils found ...

Illustrations of prehistoric North and South American animals including a glyptodon, lestodon, horse, mastodon, saber-toothed cat and a toxodon AP “Anything older than about 15,000 years still ...

During the late Pleistocene ... contributing to horses’ decline in North America. The findings could inform modern conservation approaches. Large animals, or megafauna, play critical roles ...

Like modern animals today, it’s believed Albertosaurus could have hunted in packs Across the series, the extraordinary ...

However, within this period of time (commonly referred to as the Pleistocene Epoch), there ... returned and extended southward into North America. During this time of freezing and thawing, some ...

Larger animals have a bigger surface area ... through Siberia to North America during the Pleistocene ice age (2.5 million years ago to 11,000 years ago), needed their shaggy coats to cope with ...