Today, we think of penguins as small-ish, waddling, tuxedo-birds. But they evolved from a flying ancestor, were actual giants for millions of years, and some of them were even dressed a little more casually.

Before the start of the Eocene Epoch about 56 million years ago--Antarctica was still joined to both Australia and South America. And it turns out that a lot of what we recognize about the southern hemisphere can be traced back to that...

Early primates not only lived in North America -- our primate family tree actually originated here! So what happened to those early relatives of ours?

During one of the most pivotal moments in our evolutionary story our brains actually shrank relative to our bodies.

About 59 million years ago, the largest animal lurking in the ancient forests of Colombia by far was Titanoboa - the largest snake ever known. It’s only been in the past few years that we’ve put together the many pieces of this puzzling...

From the Archean Eon to the Holocene Epoch, check out this SciShow mini-series for a primer about life on earth.

Sometimes it seems like the past favored large animals, but it turns out that each one on this list has a different reason for its size.

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Carboniferous & Permian periods 360 251...

With the non-avian dinosaurs extinct, it was time for mammals to take over. Finally, in the tiniest sliver of the history of life, humans emerge.