First ever fossilized dinosaur brain discovered

What looks like a lump of clay is actually one of the most amazing breakthroughs scientists have made in years.

Though the artifact was found the swamps of southeast England in 2004, scientists just now discovered what it was.

They determined it was actually the fossilized brain tissue of a large leaf-eating dinosaur, possibly from a species similar to the Iguanodon, according to Mashable.

According to a special publication by the Geological Society of London released Thursday, it's the world's first-known example of dinosaur brain tissue.

It's an extremely rare find because brain tissue is often one of the first parts of the body to decay.

Scientists say it shows similarities to the brains of modern-day crocodiles and birds.

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