Describe the wildlife and human occupation in desert
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The Thar Desert is the most widely populated desert in the world, with a population density of 83 people per km2.
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The Sahara Desert is the world's largest hot desert, covering much of North Africa. The adaptations of the wildlife and plants to the treacherous environment are fascinating, and the cultural history of this geographic crossroads complex and involved.
The Sahara's environment requires that the wildlife adapt to hyper-arid conditions, fierce winds, intense heat and wide temperature swings. In the heart of the Sahara, for instance, most mammals are relatively small, which helps to minimize water loss. They often meet their water needs from their diets. They take refuge in burrows during the day, hunting and foraging primarily at night, when temperatures are lower. They have developed anatomical adaptations such as the fennec fox's large ears, which help dissipate heat, and its hairy soles, which protect its feet.
Altogether, the Sahara hosts some 70 species of mammals, 90 species of resident birds, 100 species of reptiles, and numerous species of arthropods (invertebrates that have jointed limbs, segmented bodies and external skeletons). The animals include, for a few examples, Barbary sheep, oryx, anubis baboon, spotted hyena, dama gazelle, common jackal and sand fox; the birds--ostriches, secretary birds, Nubian bustards and various raptors; the reptiles--cobras, chameleons, skinks, various lizards and (where there is sufficient water) crocodiles; and the arthropods--numerous ants, scarab beetles and the "deathstalker" scorpion. The wildlife is concentrated primarily along the less severe northern and southern margins and near desert water sources.
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