Finally! An alien life creator that builds plausible ecosystems from microbes up to plant, animal, and sapient species. Not merely a rulebook for random alien generation, this guide helps you create exotic, plausible extraterrestrial biospheres from kingdom level down to clades and species. All details of intelligent beings, as well as animals, plants, and microbes are influenced by the initial conditions of the world from which they arose and the organisms from which they descend. Did intelligent life emerge on this exoplanet? Learn its strengths and weaknesses, determine its technology level, and discover how far from its home (and even out into space) the species has explored. Is your universe filled with humanoid aliens and anthropomorphic beasts? No problem! Our own future will see genetic engineering and directed evolution, where animal species may be uplifted to humanlike sapience. An entire chapter of INSTANT ALIENS will help you through this process.