Barbara Taylor studied environmental sciences at the University of Southampton before becoming a science editor and writer at London's Natural History Museum. She is a multi-award-winning author of more than 120 children's information books and encyclopedias on natural history, science and geography.Simon Treadwell attended the Istituto Europeo di Design in Milan and later worked as an Art Director in the advertising industry. As an illustrator, he became a specialist in hyperrealism, using mixed techniques, airbrush, oil, acrylic and watercolour.

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• Emperor tamarinSumatran orangutanJapanese macaqueSiamang gibbonColombian night monkeySilvery marmosetGeladaDe Brazza’s monkeyPatas monkeyDrillProboscis monkeyWestern lowland gorillaPygmy marmosetBarbary macaqueHamadryas baboonSooty mangabeyVervet monkeyBonoboGolden snub-nosed monkeyBlack-handed spider monkeyGuereza colobusAllen’s swamp monkeyRed howlerChimpanzeeMasked titiWhite-handed gibbonCommon squirrel monkeyWhite-faced capuchinBald uakariHanuman langurCommon woolly monkeyWhite-faced sakiRed-shanked douc langurBonnet macaqueDusky langurGolden lion tamarin