Clip | Graveyard of the Giant Beasts - Which giant animal was the apex predator 58 million years ago?

Sixty-five million years ago, a giant meteor hit the earth causing a global catastrophe that destroyed an estimated three quarters of the plants and animal species on the planet, including the mighty dinosaurs. Little was known about the survivors who lived in this post-apocalyptic world until a mining operation in Cerrejon, Northern Colombia —  excavating coal cut from deep within the earth’s crust — exposed an important layer in the earth’s geological history laid down more than 10 million years after the extinction of the dinosaurs.

Giant crocodiles and enormous snakes, living side by side. Scientific analysis will help put together a picture of this hostile prehistoric world to discover the strongest predator in this land filled with giants.

Secrets of the Dead: Graveyard of the Giant Beasts premieres Wednesday, November 2 at 10 p.m. on PBS (check local listings).

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65 million years ago & a giant meteor struck the earth & Global temperatures plunged and a mass extinction wiped out the dinosaurs and changed life on earth forever.

Little was known about the world that emerged after the catastrophe.

But now, a series of remarkable discoveries & It's a cute little skull.

&has opened a window onto the creatures that sprang up to take the place of the dinosaurs.

Oh man, look at that.

A coal mine rich with fossils & Now of the preservation is amazing.

&has revealed creatures familiar to us, but colossal in size.

This animal essentially became dinosaur sized.

Giant crocodiles and enormous snakes, living side by side.

So they were probably growing at about a foot and a half a year, and they just kept cooking.

What were their strengths and weaknesses?

It was a very, very fast maneuver is on the order of an eye blink.

It's going to hit it. Oh my gosh! Wow!

Scientific analysis will help put together a picture of this hostile prehistoric world & There have been these giant snakes praying on everything all over the place.

&to discover the strongest predator in this land filled with giants.

They themselves are the only things that they fear.