The population grows incessantly and steals land from the wildlife, which loses out and becomes a prize or products for trade. This defeat seems evident when one reads in a article published in Frontiers in Ecology and Evolution that 97% of the world's mammalian biomass is made up of livestock and people. The study, with an extensive bibliography of up to 285 references, compiles the threats suffered by ungulates in danger of extinction and shows the universality of the problem, from the United States to China, passing through Patagonia. Several native land mammals have suffered massive declines in recent decades, including Tibetan wild yaks, the southern Andean deer, the takin of Bhutan, the saola of Vietnam, and the wildebeest of Africa.
