Titanosaurus

Its name means titanic lizard. It is the largest known group of animals of all time. Its femur was 2.5m long (twice as long as a 10-year-old boy) and its neck was 12m long (as long as a bus), allowing it to eat the leaves on the treetops, which were more tender. Its colossal size protected it from predators, making it nearly invincible.