Felines are one of the groups of mammals in serious danger of extinction. This is due, among other reasons, to the clearing of forests, the competition with humans for space, and the hunting activities to obtain their beautiful skins which are used in clothing design. The Jaguar, the Margay and the Puma are three felines from the American continent which could disappear because of our poor use of the environment. If we learn about their habits, their diet, their main enemies, and if we join the efforts carried out by so many persons to preserve such wonderful animals, we will be able to contribute to their protection.