This video explores lesser-known prehistoric creatures that have evolved incredible adaptations to survive catastrophic events and thrive in their environment. For example, the docorus was a giant walking rock covered entirely with hard bone plates, making it virtually impervious to predators.

The megatherium, one of the largest mammals, was related to the modern-day sloth and weighed up to 4 tons. The feathered gastornis was a bloodthirsty bird that could cut its prey in half with its broad and powerful beak. Ambulo cetus was one of the first mammals to live underwater, with a streamlined body shape and fins for limbs. These weird hybrids gave rise to whales and orcas. The xenosaurus was a 10-meter long, furry duck with claws longer than Freddy Krueger's, but it was herbivorous and quite friendly. Watch the video to find out more.