The biggest dinosaurs in the world belong to the sauropod group– the giant, four-legged, long-necked plant-eaters. It’s hard to tell exactly which species was the biggest, since it’s rare to find complete dinosaur skeletons. Scientists have to use the pieces they do find and use them to estimate what the entire body size would be.

A recently-discovered dinosaur just might be the biggest known to science– a titanosaur called Patagotitan mayorum. This dinosaur reached lengths of over 120 feet long and likely weighed 76 tons, making it quite possibly the largest animal ever to walk on land. However, there are even bigger animals in the ocean– the blue whales alive today weigh 300,000 pounds!

Illustration by Levi Bernardo