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Male fish.

The first 2.5 of our population are our innovators.

This is Kanzi.

So this is a very proud owner of a beautiful dung ball.

It's a male dog.

Male and female.

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Is that dog male or female?

So, it turns out that Bill is as genetically similar to Hillary, as he is to a male chimpanzee.

Females giving rise to females, giving rise to other females.

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DG This is a female of this kind of worm.

Uh, I do like, boys, though, of course.

The first two and a half percent of our population are our innovators.

However, if she lays an egg without fertilizing it, then that egg will still grow up to be an ant, but it will always be a male.

She turned into a male.

We've separated the males from the females.

So, now we believe that the different shape of the lure is how the male recognizes the female in the anglerfish world, because many of these males are what are known as dwarf males.

This is again, something we were able to see by virtue of the fact that we had a radio transmitter in one of the snakes.

And the second is a phenomenon that males are very, very good at finding females.

In the next bit, we're going to see a couple squid.

Disappears right into the background.

(Laughter)

However, in these animals, one Z and one W chromosome together, as a pair, produces a female.

I discovered that chimpanzees reconcile after fights.

The male ape is intelligent by nature.

It's only the female mosquito that will actually bite you.

If you put more sterile males out into the environment, then the females are more likely to find a sterile male than a fertile one, and you will bring that population down.

Here's a diagram of the PCB load of dolphins in Sarasota Bay.

And these two males are fighting.

Now, here's a male on the left and a female on the right, and the male has managed to split his coloration so the female only always sees the kinder, gentler squid in him.

My favorite being, Cheese crumbs spread before a pair of copulating rats will distract the female, but not the male.

One is dead, one is alive. That must be necrophilia.

You know, in primates, there is this phenomenon called sexual dimorphism, which simply means males are larger than females and males have larger teeth than the females.

Take whiptail lizards, for example.

But next to the dead duck is a live duck, and please pay attention.

There you are. We've sent mosquito eggs.