Most mammals can develop bones in their hearts. For humans, it's usually a bad thing, but for river otters, it could be a useful adaptation.

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?

You might have a beard, or a mustache, or even a soul patch. What you don't have are whiskers. Hosted by: Hank Green

Unlike lots of other animals, there’s no such thing as the “mating season” for humans, and it might have to do with how we raise our kids.

Humans (and our pets) frequently instinctively stretch as soon as we wake up. But why? What is happening in our bodies when we stretch and yawn to wake ourselves up?

Those eerie shining orbs staring at you from the bushes when you take the trash out at night could be any number of animals, but why do their eyes glow like that? Hosted by: Michael Aranda

Cats are known for having fantastic night vision, but why is it during the day my cats can't see the treat that I'm putting right in front of them?

Their signature black and white color scheme is part of what makes pandas instantly recognizable - but not many mammals are black and white, so... why do they look like that?

When camels drink, they do so at a rate that would kill most other animals. But where does all of that water go? Hint: It's not their humps!

Like dolphins, manatees, and other marine mammals, whales have nipples hidden in surprising places.

We often think of categories as fixed, with a species being a species no matter what. The thing is, life doesn’t have to follow our rules.

Why do we prioritize human rights over those of other species? Philosopher Peter Singer dives into what he calls "speciesism," the root of the widely ignored mistreatment of animals around the world, from factory farms to product-testing...

For thousands of years, native Takhi horses roamed the steppes of Central Asia. But by the late 1960s, their extinction seemed inevitable. To prevent this, scientists and zoos started a breeding program and soon began releasing new...

In 2021, workers at a Sardinian aquarium were stunned by the birth of a smooth-hound shark. What was shocking was that, for the last decade, the shark's mother had been living only with other females. So, how was this birth possible? And...

As Arctic ice melts, polar bears are being forced on land -- and they're hungry. With the apex predators frequently turning to human junkyards for a snack, northern towns have had to get creative in order to keep both their people and...

Squeaks wants to know what happens to fish when the seasons change and the pond freezes in winter! He and Jessi learn all about how fish survive under the ice because of their body temperature, and also what other animals, like birds and...

Jessi and Anthony have been helping Squeaks learn all about flying before his big airplane ride to the robot museum so he isn’t so nervous! Here’s everything they learned together!

As Squeaks continues to prepare for his big trip with Jessi, Mr. Brown helps him learn all about different kinds of wings and how they help animals and machines fly!

Squeaks is feeling nostalgic today, so he and Jessi are revisiting times in the past that he had tons of fun with all his friends at The Fort!

In the spirit of Halloween, Anthony and Squeaks are playing Guess That Animal with some creepy creatures to remember how cool they really are.

Summer is nearly here, and that means Squeaks and Jessi will be spending lots of time playing with dirt in the garden! But it won’t just be those two out there making their garden grow big and beautiful. They’ll be getting help from lots...

Squeaks went on a trip to the beach, and wants to tell Mister Brown all about it! And, we can learn all about the science that formed the beach, plus a guest appearance by Grady the tardigrade to talk all about the plants and animals in...

Mister Brown and Squeaks are visiting Sam the Bat's family in their cave! Now, animals that live in caves are pretty special. Since caves are really dark, the animals that live there can't use eyes to see where they are going, so they...