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22 May 2013; volume 280, issue 1759

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Cover image: A Philippine tarsier (Tarsius syrichta) chews a katydid under dim mesopic light conditions. A paper by Amanda D. Melin et al., in this issue of Proceedings B (, raises the possibility that such conditions favoured the evolution of enlarged eyes and high-acuity trichromatic vision in the last common ancestor of crown tarsiers, a concept that challenges prevailing views on the adaptive origins of anthropoid primates. Photograph by Petr Slavik © used with permission.