"The story of President Thomas Jefferson's quest to locate and assemble the first full mastodon skeleton in American history."--

"Asteroids come in all shapes and sizes--and hit our planet in them, too. But what happens if a catastrophically large one approaches earth? By looking on the ground at historical asteroid craters and present-day falls, and up into space for the big ones yet to come, a wide variety of scientists are trying to figure out how to track asteroids--and how to avoid devastating impacts in the future."--

"Amazing photography accompanies engaging information about asteroid impacts. The combination of high-interest subject matter and light text is intended for students in grades 3 through 7"--

"This amazing, informative book displays all the huge, wild creatures that existed during the last Ice Age! The Ice Age started around two and a half million years ago, when our planet was covered in ice sheets. Oceans froze, forcing some animals to extinction, but some fearsome Ice Age giants survived and roamed the Earth. Giant sloths fought off saber-toothed cats, and huge birds owned the skies. Mammoths walked across ice bridges over parts of...

"Information about some of the more important and interesting extinct animals, including the animal's common name and scientific name; also includes a glossary, additional resources, and an index"--

"The Earth is 4.5 billion years old. In that time, animals have come and gone. That's nature. But sometimes, people have played a role in an animal's early disappearance. Deforestation, overhunting, and other human actions led to the dodo bird dying out. What can humans do to keep that from happening again? This book explores how people contributed to the extinction of the dodo, and what we are doing to save its endangered cousin, the kiwi"--Amazon.com....

"The oceans were once full of enormous, sharp-toothed carnivores. Megalodon was the king of the sea. Even the biggest dinosaurs fled when they saw its fin break the surface. But megalodon is no more; it went extinct. Its cousin, the great white shark, is still here, but it is endangered. What will happen if these huge fish disappear? Learn about the similarities between megalodon and great whites, and what people are doing to avoid losing another...

"Every living creature contributes towards the richness and beauty of our planet. Each one has a reason to exist, from the giant panda to the pygmy possum, and if we lose them, it will be forever. Extinctopedia tells a complex story, not just of those who are extinct, but also of those in greatest peril, with explanations of what threatens their survival. It is also a story of hope-hope for animals who have been rediscovered, hope in the form of newly-discovered...