A Field Guide to Aliens is the first truly comprehensive guide to Earth's extraterrestrial visitors and includes profiles of more than twenty-five types of aliens. With this essential field guide, you'll learn about each alien's origin, diet, and distinguishing features; check out their cool tech gadgets (from lasersaws to slime grenades); get the most up-to-date information on alien sightings; see the undeniable evidence of aliens on our planet (from a giant club found in the countryside to an oddly familiar helmet and mask left in a living room; and, find out how you can become an alienologist, too. Have you ever noticed strange words spelled out in the night sky? Do you know which alien can’t be alone? Are you sure that a Knutt has never played a prank on you? Find out all of that and more in this delightfully eerie collection of extraterrestrial lore.