It is very difficult to say that one lemur species is more endangered than another. There are around 100 species of these primates, all of which live on the Island of Madagascar, off the southeast coast of Africa. Virtually all of them are declining dramatically in population, mostly because of habitat loss due to logging in the forests where they live—but also because of illegal hunting. Many lemur species are listed as Endangered or Critically Endangered by the International Union for the Conservation of Nature (IUCN).