Britannica Educational Publishing 
Rats, Bats, and Xenarthrans [PDF ebook] 

While we may often find them nestled in the corners of our attics or traversing our yards, rodents and bats are more frequently found in nature and originate in a large variety of shapes and sizes. Together they make up over half of the planet’s mammal species. While there are only 29 species of xenarthrans-an ancient line of mammals comprised of sloths, anteaters, and armadillos-they are significant players in various ecosystems, as well. This colorful volume considers the features, behaviors, and major species of these three intriguing categories of mammals.