Squeaks and Jessi have been having fun learning all about Australia. Squeaks wants to know more about marsupials, the special group of animals that lives almost nowhere else. So Jessi introduces him to a...

Most humans might be right-handed, but plenty of other animals have a preferred hand (or whatever they've got instead of hands) too. The more general term is lateralization, and it's found in everything from kangaroos to octopuses.<br/>

The story of the egg spans millions of years, from the first vertebrates that dared to venture onto land to today’s mammals, including the platypus, and of course birds. Like chickens? We’re here to tell you: The egg came first.

Throughout the Cenozoic Era -- the era we’re in now -- marsupials and their metatherian relatives flourished all over South America, filling all kinds of ecological niches and radiating into forms that still thrive on other continents.

Both North and South America have their own species of marsupial, the opossum, but how they got so far away from their Australian relatives is a bit of a mystery.

In the animal kingdom, sleeping can be dangerous. Lying completely motionless and unconscious for hours at a time is just asking for trouble. There are, however, some sleepy risk-takers who spend almost all of their days snoozing.

Yapoks are cute aquatic marsupials, and they're the only living creatures that need pouches for their sacs.

We generally think of pregnancy as a continuous process, but scientists have recently discovered mechanisms that allow for certain mammals to put the development of a fetus on pause.

Natural selection can lead to some pretty amazing adaptations, but sometimes the resulting traits aren’t the most efficient solutions to the problems at hand. With the bar set to “good enough,” here are some features that arose from...

Dr. Shini Somara joins us on the Talk Show today to talk Crash Course Physics and her background in fluid dynamics and television. Then Jessi from Animal Wonders brings on Sydney, their Brush-tailed Bettong.

In the animal kingdom, sleeping can be dangerous. Lying completely motionless and unconscious for hours at a time is just asking for trouble. There are, however, some sleepy risk-takers who spend almost all of their days snoozing.

We generally think of pregnancy as a continuous process, but scientists have recently discovered mechanisms that allow for certain mammals to put the development of a fetus on pause.

Featuring Katherine Green, Content and Social Media Manager for SciShow and also Hank's wife, and Quigley, the brush-tailed bettong or woylie.

All mammals share certain characteristics, like warm blood and backbones. But despite their similarities, these creatures also have many biological differences - and one of the most remarkable differences is how they give birth. Kate...

Both North and South America have their own species of marsupial, the opossum, but how they got so far away from their Australian relatives is a bit of a mystery.

Yapoks are cute aquatic marsupials, and they're the only living creatures that need pouches for their sacs.

Hank gets real with us in a discussion of evolution - it's a thing, not a debate. Gene distribution changes over time, across successive generations, to give rise to diversity at every level of biological organization.

See what it's like to care for this tiny marsupial, born only the size of a kidney bean.

The curious baby wallaby is ready to explore on his own after being in and out of his mother's pouch for more than half a year.

The curious baby wallaby is ready to explore on his own after being in and out of his mother's pouch for more than half a year.

See what it's like to care for this tiny marsupial, born only the size of a kidney bean.

Aussie native Olivia Degn introduces you to some kangaroos and wallabies that people have traveled thousands of miles just to see.

The curious Parma wallaby joey is ready to explore on his own after being in and out of his mother's pouch for more than half a year.

Playtime is now in session.