Understanding the human body is a team effort. That's where the Yachtel group comes in.

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.jp. That's Y-A-K-U-L-T.C-O.J-P. When it comes to a guide for your, and I'm Flor Lichten.

This week, I want to take you bird watching. But I'm not talking about an ordinary passerine peep show.

We are skipping the songbirds.

It's a no-fly zone for hawks and raptors.

Waterfowl?

Throw in the towel.

The birds we're going to meet.

They're not like anything you've ever peeped.

They used the beak as an axe to kill prey.

Oh my god.

So just imagine the largest thing you've ever seen alive flying.

They are colossal, around 1,900 pounds.

The eggs would have been about 150 times the size of a chicken egg.

Two feet for feathers, which is, that's a big feather.

Most people, you know, think ostrich, and they think that's big, but actually

they were real giants around it one time. We are talking about birds that weighed as much as a

sports car, birds who were the top predators of their day, prowling the jungle and devouring

animals the size of small horses. Birds so gargantuan that you

...