Ages 6 to 12 years. When most people think of migration, they think of birds flying south to escape the cold winter -- but many other animals migrate for many different reasons. From whales and deer to butterflies and eels, animals migrate to breed, feed, stay warm, find water, and even fall asleep! In each case, animals follow paths that have been passed on for generations helping their species survive. Children will be amazed by: the Arctic tern -- a bird that travels from the Arctic to Antarctic and back every year!; the journey of the salmon, which swims against strong river currents to lay its eggs; the lemming, whose mass migration can include thousands of animals; the Canada goose, whose unique "V" flight pattern makes the trip easier.