If you've ever watched an animal sleep and wondered what they're dreaming about, science has the answers.

With their squishy bodies and color-changing abilities, octopuses and other cephalopods already look like our planet’s resident aliens. But researchers have discovered yet another thing that separates them from most other animals on...

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...

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.

With their squishy bodies and color-changing abilities, octopuses and other cephalopods already look like our planet’s resident aliens. But researchers have discovered yet another thing that separates them from most other animals on Earth!

What is the world's favorite fossil? Why the orthoceras of course! Hank will tell why that is in this episode of SciShow. Find out how you can get your very own orthoceras fossil.

Humans often take inspiration from nature when coming up with inventions, and this includes breakthroughs in fabric design that help to forward the fabulous and functional world of fashion.

Hank introduces us to the "simplest" of the animals, complexity-wise: beginning with sponges (whose very inclusion in the list as "animals" has been called into question because they are so simple) and finishing with the most complex...

The octopus is a pretty odd animal under even the most ordinary circumstances – or ordinary by octopus standards, at least. So when folks start calling out one type of octopus as the strangest, there’s probably something special about...

Join Nate Jaros, curator of fish and invertebrates at Aquarium of the Pacific, to learn what it takes to care for these aquatic oddities.

Cephalopods, a group that includes octopus and squid, are a bunch of aquatic oddballs with some really unique behaviors.

Cephalopods, a group that includes octopus and squid, are a bunch of aquatic oddballs with some really unique behaviors.

Cephalopods, a group that includes octopus and squid, are a bunch of aquatic oddballs with some really unique behaviors.

Visit the shallow spawning grounds of the colour-changing reef squid. Biology - Animal Kingdom - Learning Points. The southern reef squid is one of around 800 species of cephalopod. Cephalopods are the most intelligent of all...

We now arrive at the most famous of the mollusks, the cephalopods. These include squids, nautiluses, cuttlefish, and the fascinating octopuses. These creatures are the largest and most intelligent invertebrates on Earth. Let's learn all...

A lot of techniques and methods used in neuroscience have been developed thanks to modern technology and science. But what did neuroscientists do back in the day before all this fancy stuff? Well, turns out the giant squid axon was...

Let's go hunting for vampires in the inky realm of perpetual night.

This video provides a brief introduction to mollusks, a diverse group of invertebrate animals that includes clams, mussels, oysters, scallops, squid, and more. Additionally, it highlights the unique characteristics of cephalopods, such...

Veined octopus (Amphioctopus marginatus) excavating a burrow in sand. It changes its skin colour as it does so. Filmed in the Lembeh Strait, Sulawesi, Indonesia

Octopus locomotion, Sabah

Close up view of an octopus in a fish tank, emerging from the dark

Close up view of an octopus in a fish tank, emerging from the dark

Close up view of an octopus in a fish tank, emerging from the dark

Close up view of an octopus in a fish tank, emerging from the dark