Iguanodon

Iguanodon was a hefty plant-eating dinosaur that roamed parts of Europe during the Early Cretaceous, around 126 million years ago. It stood out with its thumb spikes, likely for defense, and flexible pinky fingers perfect for grabbing vegetation.

• Grew up to 11 meters long—about the length of a school bus.
• Weighed as much as 4.5 metric tons, roughly three small cars.
• Had thumb spikes possibly used to jab at predators.