The apatosaurus grew up to 75 feet long! These enormous dinosaurs stomped the earth 160 million years ago, but paleontologists still study them today!.
"The story of President Thomas Jefferson's quest to locate and assemble the first full mastodon skeleton in American history"--Provided by the publisher.
Examines extinct species, including early humans, and discusses why extinction happens, as well as how information is gathered on species that existed before humans evolved.
Uses timelines and detailed case studies to explore how various species have become extinct throughout history and how those extinctions have impacted life on Earth.