Imagine a sea scorpion weighing more than 800 pounds and over 8 feet in length. It's terrifying--but also really cool! What happened to such a creature? And what arthropods descended from it? In this detailed book, readers investigate the prehistoric insects, bugs, and invertebrates that either died out or in part gave rise to life on Earth today. Bug lovers and geology enthusiasts alike can enjoy the many creatures included in this illustrated volume, learning when they lived, sometimes how they died, what they may have looked, and what they may have eaten!