Bella's X-rays revealed the mystery: Two femurs, two tibias, two fibulas and nine toes. Basically, a fifth leg. "I actually thought somebody was playing an AI prank on me or was playing in ...

Instead, it separates from the ankle where it was first attached and grows thinner and more spindle-like. Dinosaurs, like humans, had full fibulas to help support their massive weight. It seems that, ...