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The giraffe is a species of ungulate mammals, artiodactyl and ruminant, native to African savannas and widespread from Chad to South Africa. After millions of years of evolution, the giraffe has acquired a unique anatomy with a particularly elongated neck that allows him to graze the treetops. It is the tallest animal in the world and can reach up to 5.50 m or even 5.80 m thanks to the length of its neck. Giraffes sleep very little, less than 2 hours for 24 hours, and more readily during the day, as they can continue to monitor the horizon. In reality, they are sleepy standing, their eyes wide open and for periods ranging from 1 to 30 minutes in a row. Its red-dominant coat is cross-linked or spotted with yellow; his belly is white. Its tail, thin and long, finished with a brush of black hairs, measures from 70 cm to 100 cm. Contrary to popular belief, giraffes have vocal cords, but they rarely emit sounds, relying more on vision than on hearing to communicate via, for example, postures and movements of the neck and head. . In the dark, giraffes still use oral communication, they produce a thud, a kind of buzz around 92Hz, that is to say the limit of human perception. Nevertheless, it is possible to hear giraffes screaming under stress of a cry approaching the bellow of cattle. The giraffe is the only terrestrial mammal that does not yawn. Its life expectancy is around 26 years (over 36 years in captivity).