No animals had ever done this before! This is partly why the dinosaurs could not protect their eggs and babies when the cold weather came about. The eggs and the young are either frozen to death or eaten by other dinosaurs and the smaller, smarter animals. These were no young dinosaurs to replace the old ones as they died as they could not adapt they could not survive and became extinct. Since the dinosaurs refused to follow the laws of nature and change to survive in their surrounding, they were no longer needed as other life continues to change on earth. The only armored reptiles which remain today are crocodiles and tortoises and turtles still leave their eggs to hatch in the sand and abandon them for birds and animals to devour.