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But in a 2013 study in the journal Proceedings of the National Academy of Science, Burnham and his colleagues unveiled direct evidence of tooth embedded in a duckbill dinosaur's tailbone, which healed over the tooth (meaning the duckbill got away)."We found the smoking gun! "With this discovery, we now know the monster in our dreams is real." hunted alone or in packs.

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Subsequently, researchers from the UK and Australia analysed it using advanced scanning techniques.

In doing so, they were able to identify tough membranes that surround the brain, along with strands of collagen and blood vessels.

Importantly, may be big, but its predecessors were small.

The first tyrannosaurs, which were human- to horse-size, originated about 170 million years ago during the mid-Jurassic.

And brain tissue is some of the least commonly preserved soft tissue – mostly because fossilised brains are very rare and easily broken down.

But researchers at the University of Cambridge have now announced the discovery of a brain specimen dating back 133 million years, which was preserved by being "pickled" in highly acidic water and low oxygen just after it died."What we think happened is that this particular dinosaur died in or near a body of water, and its head ended up partially buried in the sediment at the bottom," said study co-author David Norman.

It was among the last of the non-avian dinosaurs to exist prior to the Cretaceous-Paleogene extinction event, which wiped out the dinosaurs.

More mobile than many other land-based dinosaurs, have been unearthed, according to National Geographic.

However, researchers say this is probably not the case.

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