On a reef in the Pacific Ocean, 17,000 camouflage groupers dart about in the cloudy water. It is, in fact, an underwater orgy— turned feeding frenzy. An orgy might seem like a rather flamboyant way to breed, but sex in the sea is a...

In the savannahs of Kenya, two female northern white rhinos, Nájin and Fatu, munch contentedly on grass. They are the last two known northern white rhinos left on Earth. Their species is functionally extinct— without a male, they can't...

Explore inheritance when carried on the X chromosome with the Amoeba Sisters! This video focuses on how to do general Punnett square problems that involve traits on the sex chromosomes (X and Y chromosomes). We do want to point out...

In which John Green and Hank Green teach you about how human primates moved out of Africa and turned Earth into a real-life Planet of the Apes. And the apes are people! John and Hank teach you about how humans evolved, and the sort of...

Let's talk about some of the awesome single dads out there in the animal kingdom!

In this fascinating look at the "alpha male," primatologist Frans de Waal explores the privileges and costs of power while drawing surprising parallels between how humans and primates choose their leaders. His research reveals some of...

Warning! This episode is a little gross… Between 1/3 and 1/2 of all life on earth is parasitic - and here are 4 of the creepiest parasites we know about.

Hank sits down with clinical sexologist Dr. Lindsey Doe and talks about 'fighter sperm'. Then Jessi from Animal Wonders comes on to show off her Quaker Parrot the 'monogamous bird'.

Hank lets us in on the meaning of life, at least from a biological perspective - it's reproduction, which answers the essential question of all organisms: how do I make more of myself? So, sex, how does it work?

Hank gets into why sex is the preferred method of reproduction for most species - and it's not for the reasons you're thinking.

SciShow Psych host Brit Garner joins Hank to talk about wildlife conservation, big data, and Complexly’s new show Nature League, and Jessi stops in with a whole mess of invertebrates.

For the first time, researchers have observed two cases of asexual reproduction in condors. And it also turns out that whales are much hungrier than we thought.

Kristie Overstreet is on a mission to ensure that the transgender community gets their health care needs met. In this informative, myth-busting talk, she provides a primer for understanding gender identity and invites us to shift how we...

SciShow explores one of the more rare and unusual results of sexual reproduction: gynandromorphy, in which an animal is part male and part female.

You may have heard the rumor. Every seven years your body becomes a whole new person. But is there anything to this? Check out this SciShow episode to find out!

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

After weeks of discussion of human reproduction, today we arrive at the main event: THE SEX. Hank explains the four phases of the human sexual response, how a sperm finds and fertilizes an egg, creating a zygote, and how different...

Today we’re going to talk about Bayes Theorem and Bayesian hypothesis testing. Bayesian methods like these are different from how we've been approaching statistics so far, because they allow us to update our beliefs as we gather new...

You probably have a vague idea of what sperm does, but not all sperm are created equal, and some have even developed unique adaptations to get where they're going.

From something as small and complex as a chromosome to something as seemingly simple as the weather, sex determination systems vary significantly across the animal kingdom. Biologist and teacher Aaron Reedy shows us the amazing...

What's both edible, and capable of sending you an email to let you know there's explosives nearby? Spinach! Well, spinach with some nanotechnology embedded within it. Learn how Popeye's favorite veggie is involved in the field of plant...

It's spring where Jessi and Squeaks lives, and that means the air is filled with the sounds of birds singing! But have you ever wondered why birds sing and who they're signing to?

Male birds have the largest genital diversity of any class of animals because their sex chromosomes make it easy to pass male-helping mutations down the...

When it comes to sex things can be complicated, but for the three species we are looking at today, sex is really hard.