The Coleopterists Society is an international organization devoted to the study of all aspects of systematics and biology of beetles of the world. Beetles, the insect order Coleoptera, are one of the dominant forms of life on earth. One of every five described species of all animals or plants is a beetle! Various species live in nearly every habitat except the open sea, and for every possible kind of food, there's probably at least one beetle species that eats it.