Did you know that some dinosaur eggs were huge—nearly the size of footballs! Go to zoobooks.com to learn where dinosaurs live, what they eat, how they hunt and how they reproduce. You can even pet a dinosaur in Zoobooks Virtual Zoo!If someone were to ask you which group of animals was the most successful in the world, you would be safe to answer 'dinosaurs.' The reason? Dinosaurs lived on earth for more than 160 million years—about 30 times longer than we humans have been around. Dinosaurs dominated the world so thoroughly that the entire period was called the Age of Dinosaurs

Some female dolphins serve as "aunties" to help protect the babies from danger. They will work together to form "playpens" around their young by swimming in a circle. Go to zoonbooks.com to learn where dolphins live, what they eat, how they hunt and how they reproduce. You can even pet a dolphin in Zoobooks Virtual Zoo!No one knows why dolphins push people or objects toward the shore, but they have done it many times. During World War II, a group of American airmen were stranded in a raft when two dolphins came along and pushed them toward land. Dolphins regularly help fishermen in Brazil and other places by herding fish into their nets. In return, we have immortalized dolphins on murals, jewelry, and in stories. Their intelligence and friendliness continue to intrigue us.