Could an animal as large as the blue whale exist on land?

This is energy that a mammal can't devote to increasing its body size. So it makes sense that the largest mammals we know of are roughly one-tenth as large as the largest reptiles ever found, Smith says. read more

A main reason animals exist so large in the ocean is due to the buoyancy of the water. There is no pressure on a blue whale's body because it is floating. However, if you put an animal the size of a blue whale on land the gravity will cause serious problems with it's legs. Some of the largest prehistoric animals were aquatic for this reason. read more

Well, powered flight and being able to take off at large body sizes limits how large a flighted animal can be. Nevertheless, there have been some huge birds: Ratites are large, although the largest, the moa and the Elephant bird, are extinct. read more

This puts blue whales well above any known land mammal in terms of size. Most people believe that the largest animals to ever exist on Earth were the dinosaurs. However, one of the largest land dinosaurs, the sauropod Argentinosaurus, weighed only about 180,000 pounds (81,647 kg). read more