Animals group in different ways. Some newborn animals are helpless but their mothers protect them. A newborn kangaroo is very small. It is only a few centimeters long. It closes its eyes and doesn't have hair. It stays safe in its mother's pouch (育儿袋) for a long time. A newborn monkey can not walk, Its mother carries it everywhere. Other baby animals can walk soon after they're born. They learn to run with their mothers when danger is near. A bay zebra can run, an hour after it is born. Some baby animals are born in a place that is safe. Baby wolves are usually born in big holes with little light. Other baby animals are born in the open.A baby elephant is often born on the open land. Animals that drink their mothers' milk are called mammals. A mother bear's milk is rich. Baby bears have milk for a few months. This is the same with baby zebras. As baby animals grow, they need solid (固体的) food. Baby lions eat what their mother can catch!