Primates are a diverse order of mammals. They are divided into the strepsirrhines, which include the lemurs, galagos, and lorisidae, and the haplorhines, which include the tarsiers and the simians (monkeys, apes, and humans). Primates arose 85–55 million years ago first from small terrestrial mammals, which adapted to living in the trees of tropical forests: many primate characteristics represent adaptations to life in this challenging environment, including large brains, visual acuity, color vision, a shoulder girdle allowing a large degree of movement in the shoulder joint, and dexterous hands. Primates are among the most social of animals, forming pairs or family groups, uni-male harems, and multi-male/multi-female groups. Primates range in size from Madame Berthe's mouse lemur, which weighs 30 g (1 oz), to the eastern gorilla, weighing over 200 kg (440 lb). There are 376–524 species of living primates, depending on which classification is used. New primate species continue to be discovered: over 25 species were described in the 2000s, 36 in the 2010s, and three in the 2020s. Explore the world of Wild Primates from the most fierce to the ultra rare through rich images and a wealth of recent information, including interesting facts,strange and weird behaviors, habitats and habits,and all things!