here are some animals that used to be bigger so millipedes used to be 2 m long 30 million years ago and were thought to have no natural predators and even ate meat and while that’s big snakes used to be much larger like the Titanoboa which was 13 M long and it would Feast on crocodiles speaking of crocodiles they used to reach 35 ft in size and they would eat dinosaurs as part of their diet Cave Bears used to be 50% larger than our current grizzly bears and much more lean and muscular but even b