Largest Extinct Animals In The World. Having changed little from their ancestors, they are known as living fossils, but despite their fascinating nature, they are endangered and rare in the wild. In fact, the blue whale is the largest animal to have ever existed, but they live in the sea and weren’t included on this list.most of the land mammals on this list are extinct, but a few of them are still alive today.

The largest extinct arthropod is jaekelopterus rhenaniae, a giant sea scorpion that grew to be up to 8.2 feet (2.5 m) long, and the claws, when extended, could have added about a meter to the. It is estimated that between 3 and 5 billion passenger pigeons inhabited the us when europeans arrived in north america, but their settlement led to mass deforestation resulting in habitat loss and a reduction in the bird population. View image of museum model of a titanoboa cerrejonensis (credit:

Areas off the california coast hold the densest population.

One of the world’s largest collections of prehistoric rock art has been discovered in the amazonian rainforest. One of the world’s largest collections of prehistoric rock art has been discovered in the amazonian rainforest. But some other extinct animals were longer, if not heavier than blue whales, most being dinosaurs. View image of museum model of a titanoboa cerrejonensis (credit: