Enormous herds of rhino-like animals turned parts of what is now Argentina into minefields of dung.
The new meat-eating Cretaceous dinosaur was so big, it's now on the list of the top three largest North American predatory dinosaurs.
A newly discovered dinosaur, Lythronax, was an early relative of T. rex and had big sharp teeth and binocular vision.
The huge-clawed, bird-like dinos appear to have gathered communally to nest.
A virtual recreation of the world's biggest known terrestrial animal shows that it lumbered along at around 5 miles per hour.
Thin-toed footprints pressed into a sandy riverbank more than 100 million years ago are the continent's oldest known bird tracks.
The ancestors of modern carpenter bees may have become extinct roughly 65 million years ago, around the same time the dinosaurs were wiped out.
Dino skeleton is the smallest, youngest and most complete duck-billed dinosaur of its kind ever found.
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