 Primate skulls, from Adapis (Eocene) at left to New World monkey, Old World monkey and gibbon at right
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 PRIMATE GIBBON BLACK CRESTED GIBBON WULIANGSHAN NATURE RESERVE YUNNAN CHINA (4).jpg
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 NP2009.jpg
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 Gibbon, Western Hoolock (male) @ Hoollongapar Gibbon Sanctuary
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 PRIMATE GIBBON JAVAN GIBBON GEDE NATIONAL PARK JAVA BARAT INDONESIA (20).JPG
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