Each entry includes key information either in chart or picture form that lists the name, pronunciation, and its meaning, as well as scientific classification, location of the fossil on a map of the world, estimated size in comparison to an average human, and the time period in which the animal existed. Extensive explanations of each animal follow, and include a detailed introduction, classification, anatomy, reproduction and population, intelligence, diet, behavior, habitat and other life forms, research, bibliography on relevant sources, websites for further research, and a vocabulary chart of pertinent words.