Gebrils belong to the Gerbillinae family of rodents. They have very sharp incisor teeth, and they need to constantly gnaw on things to prevent excessive growth. Gerbils are naturally sweet, kind-hearted, fearless and amicable, and they are healthy in almost any environment. There are 31 species of Gebrils in the world, and the Mongolian Gerbil is the most popular one as a pet. Gerbils do not require much food.