The International Union for Conservation of Nature (IUCN) has revealed that as many as half of all species of primates are in danger of extinction. Although habitat loss from deforestation is the primary threat, the bushmeat trade is also a principal factor. All of the great apes, especially chimpanzees, bonobos and gorillas, as well as most monkey species, are hunted for their meat throughout Africa, Central and South America and Asia. Because humans are primates too, they are susceptible to disease transmitted through exposure to bushmeat. Both HIV and Ebola, for instance, have been linked to great apes.