Watch Free Online HD Moviesjoy. Animals are true superheroes. They have superpowers that we humans can only dream of. Some grow back their limbs after they have lost them. Others let huge bones grow on their heads at a rapid speed. And some can go into hibernation for months without losing muscle. Their skills could help humans against Alzheimer’s, heart attack and osteoporosis. But these superpowers are still a mystery. How do animals do that? Scientists are trying to solve the riddles to help save human lives.