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Treeshrews [(a) Tupaia tana] and woolly opossums [(b) Caluromys derbianus] are phyletic and/or ecological analogues of ancestral primates, factors that invite study of their opsin genes. Panel (b) also depicts the pollination of balsa (Ochroma pyramidale) under twilight conditions [Kays et al. 2012]. Photographs by Wong Tsu Shi and Christian Ziegler, respectively, and reproduced with permission.
