[GROWLING]

We've got a big bull elephant, just yards away from us.

It's been here all night.

A young male who appears to have

been kicked out of his herd, he's quick to change his mood.

I'm very nervous around this elephant.

He is a bull in musk.

He has the runny ears, the runny glands.

That's a bull in musk.

That's pretty much the most aggressive animal on earth.

When a bull elephant this in musk,

he attracts females in heat, but also produces 40 to 60 times

more testosterone, making him highly aggressive

to other elephants and humans.

Wow.