Reference

N. L. Mundy, N.C. Morningstar, A. L. Baden, E. Fernandez-Duque, V. M. Davalos, B. J. Bradley (2016): Can colour vision re-evolve? Variation in the X-linked opsin locus of cathemeral Azara’s owl monkeys (Aotus azarae azarae) – Frontiers in Zoology – 2016: 9-0001-9-0004.