As the sun rises over a quiet coral reef, one animal breaks the morning silence. Named for its vibrant scales and beak-like teeth, the parrotfish devours a particularly crunchy breakfast: rocks. Why would any creature take bites out of...

Chromosome shenanigans have resulted in some unexpected hybrid fishes. Also, this record-breaking mouse lives at a ridiculous altitude.

The blobfish has been called "The World's Ugliest Animal", but it's actually really cool. Find out why it's shaped the way it is with Jessi and Squeaks.

We all share one planet -- we breathe the same air, drink the same water and depend on the same oceans, forests and biodiversity. economist Naoko Ishii is on a mission to protect these shared resources, known as the global commons, that...

You might not think much of your tongue, but without it, we may have never conquered dry land and the world as we know it.

When you think "parasite," you might think of leeches or some nasty tape worm, but there are some that can live inside your very own cells. Chapters Plasmodium 0:56 Rickettsia 2:49 ROCKY MOUNTAIN SPOTTED FEVER 2:59 Legionella 4:09...

Legendary ocean researcher Sylvia Earle shares astonishing images of the ocean -- and shocking stats about its rapid decline -- as she makes her TED Prize wish: that we will join her in protecting the vital blue heart of the planet.

From Ancient Greece to the 20th century, Aristotle, Freud, and numerous other scholars were all looking for the same thing: eel testicles. Freshwater eels could be found in rivers across Europe, but no one had ever seen them mate and no...

Our friend the Giant Squid inspired a SciShow Kids viewer to write us and ask, 'What is squid ink, and can you write with it?' Jessi has the answers!

The ancestors of modern, squishy cephalopods like the octopus and the squid all had shells. In ancient times, their shell was their greatest asset but it eventually proved to be their biggest weakness.

Why do chickens and turkeys have white meat and dark meat? And, like, gross, but .. do humans have the same thing? It's all about our muscles: what they're made of, and what they're made for. Quick Questions has the answers!

We used to think that the human brain was a lot like a computer; using logic to figure out complicated problems. It turns out, it's a lot more complex and, well, weird than that. In this episode of Crash Course Psychology, Hank...

You might think that fish ride the undercurrents with all their buds to avoid the hungry mouths of predators - safety in numbers, right? But, it turns out, there’s more to consider when asking why fish swim in schools.

Life on Earth has always been shaped by other bodies in space, and life in our oceans is especially susceptible to interactions that have huge effects on life as we know it!

In the 1950s, the people of Minamata, Japan started seeing strange behavior from the local cats, and it wasn't long before humans were showing the same symptoms.

When it comes to creating vegetarian meat substitutes, flavor is only one hurdle—smell and texture are also major factors, and scientists have been making breakthroughs on creating a convincing meatless meat experience. We also got some...

There are some weird animals out there, but few environments have produced stranger creatures than the deep ocean!

Every day, we use materials from the earth without thinking, for free. But what if we had to pay for their true value: would it make us more careful about what we use and what we waste? Think of Pavan Sukhdev as nature's banker --...

Eyes have been around for a long time, like... half a billion years or so... and in that time, animals have evolved lots of amazing ways to observe the world around them!

The lower Congo River is treacherous, turbulent, and very deep. While that might seem like an inhospitable habitat, hundreds of species of fish thrive there, including some that are really bizarre!SciShow is supported by Brilliant.org.

Temnospondyls were a huge group of amphibians that existed for 210 million years. And calling them 'diverse' would be putting it mildly. Yet in the end, two major threats would push them to extinction: the always-changing climate and the...

A little over a decade ago, a neuroscientist found "significant activation" in the neural tissue of a dead fish. While it didn't prove the existence of zombie fish, it did point out a huge statistical problem.

The little fish Danio rerio holds secrets to understanding how vertebrates develop, how diseases like cancer work, and how we might one day learn how to regenerate human heart tissue.

If you've ever been to, or lived in, or even flown over the central swath of North America, then you've seen the remnants of what was a uniquely fascinating environment. Scientists call it the Western Interior Seaway, and at its greatest...