iguanodon
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Scientists find the first known dinosaur brain tissue fossil
That lump you see above many not look like much at first blush, but it's a big deal for paleontology: scientists say they have discovered that the sample has the first known example of a dinosaur brain tissue fossil. The team used a scanning electron microscope to detect mineralized blood vessels, collagen, membranes and possibly brain cortex in the remains of an iguanodonid that lived about 133 million years ago. The findings suggest that the dino's brain had a lot in common with those of modern birds and reptiles. Instead of completely filling the cranial cavity, the brain matter significant space for blood vessels and sinuses.
