You might have heard that a quarter of your skeleton is in your shoes, and that's true, as long as they're closed-toe. So why do we need that many foot bones? The answer is more complicated than you think, and to get to the bottom of...

About 360-ish million years ago, some tetrapods moved onto land and changed the course of history. So we'd love to know more about these guys, and what it took to get there. But the thing is, the fossils we need to understand this...

Today, all mammals from humans to bats have five fingers or fewer. Yes, even whales, whose finger bones are hidden in their fins. Birds have four or fewer and amphibians get the best of both worlds, often having four digits on their...

Around the time that some of our fishapod relatives were crawling out of the water, others were turning around and diving right back in.

As revolutionary as teeth were, they would go on to disappear in some groups of vertebrates. But why?

When we picture the first tetrapods, or land vertebrates, crawling out of the ocean, we probably imagine they need legs. But evolution also had to bestow another important adaptation before they could leave the water: blinking!

From the long extinct Stegosaurus, to tiny modern mice, all sorts of animals grow bits of bones inside their skin. These structures are called osteoderms, and they're often more than just a suit of armor.

When you think of milk, you might think of mammals like humans and cows, but there are other species that give food to their young, in their own weird ways.

Lizards tend to scurry around in short bursts rather than running long distances, and the reason why might be nearly as old as life on land. Hosted by: Stefan Chin

Is there a chance that more species may actually be closer to fish than we originally thought?

Right at the beginning of the Paleozoic, there was a huge explosion of more complex life. And that’s when things started to get really interesting. This is our second installment on the history of life, but you can watch in any order you...

When you think of milk, you might think of mammals like humans and cows, but there are other species that give food to their young, in their own weird ways. Chapters FLAMINGOS 0:56 SPIDERS 1:55 PSEUDOSCORPIONS 3:23 CAECILIANS 5:13...

Congratulations! By being here, alive, you are one of history's winners -- the culmination of a success story four billion years in the making. The other 99 percent of species who have ever lived on earth are dead -- killed by fire,...

This week, scientists discover something in a fish fossil that might give us a hand in finding our earliest land-dwelling ancestors.

Jessi from Animal Wonders gets a Quiz Show rematch against Hank. Will he prevail this time, or commit an animal blunder?

Lizards tend to scurry around in short bursts rather than running long distances, and the reason why might be nearly as old as life on land.

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

Emily Graslie joins us to share the wonder of how shoulders, humble as they may be, have played a huge role in the evolution of mammals the world over. Thanks to the Museum of Comparative Zoology at Havard and The Field Museum for...

Hank introduces us to ourselves by taking us on a journey through the fascinatingly diverse phyla known as chordata. And the next time someone asks you who you are, you can give them the facts: you're a mammalian amniotic tetrapodal...

We have now completed our study of every single animal phylum but one: Chordata. This is the one that contains humans, as well as the most common animals we interact with every day, like our pets. There are about 81,600 species of...

Welcome back to the Fluctus Channel to explore how the latest technology is used to study the power of sea waves. Fluctus is a website and YouTube channel dedicated to sea geeks. Whenever you are curious or an incorrigible lover of this...

Over millions of years, fish species evolved to leave water and survive on land, producing the characteristics shared by all amphibians. Biology - Animal Kingdom - Learning Points. The coelacanth is a lobe-finned fish that evolved 400...

Ozone depletion may have triggered a mass die-off of ancient fish and plants by ultraviolet ray exposure 358 million years ago.