The partial skeleton of an ancient whale shows it could've weighed nearly as much as a Boeing 747, making it one of the heaviest animals ever

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Reconstruction of Perucetus colossus in its coastal habitat, a manatee-like ancient whale with a tiny head and small limbs
Since its skull and limbs were missing, much about Perucetus colossus remains a mystery.

Alberto Gennari

A new fossil shows a prehistoric badger-like mammal and a dinosaur locked in 'mortal combat'

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A fossil of a Psittacosaurus dinosaur and Repenomamus mammal skeletons fighting, with the mammal on top and biting into the dinosaur
The Repenomamus is on top of the Psittacosaurus, biting into its ribs.

Gang Han

A T. rex skeleton sold at auction for more than $5 million. It's been named Trinity and will reside in Europe's oldest skyscraper.

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A male auctioneer pointing at the T. rex skull for sale
The skull of a T. rex skeleton named Trinity sold at auction in Switzerland for more than $5 million.

(Michael Buholzer/Keystone via AP)

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