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hamadryas baboon
The hamadryas baboon (''Papio hamadryas'') is a species of baboon from the Old World monkey family. It is the northernmost of all the baboons, being native to the Horn of Africa and the southwestern tip of the Arabian Peninsula. These regions provide habitats with the advantage for this species of fewer natural predators than central or southern Africa where other baboons reside. The hamadryas baboon was a sacred animal to the ancient Egyptians and appears in various roles in ancient Egyptian religion, hence its alternative name of 'sacred baboon'.
==Physical description==
Apart from the striking size difference between the sexes (males are often twice as large as females), which is common to all baboons, this species also shows sexual dimorphism in coloration. The fur of males is silver-white in color and they have a pronounced cape (mane and mantle) which they develop around the age of ten, while the females are capeless and brown. Their faces range in color from red to tan to a dark brown.
Males may have a body measurement of up to and weigh ; females weigh and have a body length of .〔(【引用サイトリンク】url=http://www.waza.org/en/zoo/visit-the-zoo/primates-1254385523/monkeys-1254385523/papio-hamadryas )〕 The tail adds a further to the length, and ends in a small tuft. Infants are dark in coloration and lighten after about one year. Hamadryas baboons reach sexual maturity at about 51 mo for females and between 57 and 81 mo for males.〔Rowe, Noel. The Pictorial Guide to Living Primates, Pogonias Press (Charlestown, Rhode Island: 1996)〕
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