Update Video: Why the blue balls?

Due to some new research and information sent my way I decided that it was absolutely necessary to update some information from my original video on vervets monkeys!
Special thanks to Pooja Dongre for sending me the info on the 2020 paper by Young et al. and for helping me edit my old information! Pooja is a PhD Student at the University of Lausanne and has done absolutely fantastic work on vervet social integration.
Follow her on twitter @p_dongre92
www.researchgate.net/profile/...
References:
Berglund A, Bisazza A, Pilastro A (1996) Armaments and ornaments: an evolutionary explanation of traits of dual utility. Biol J Linn Soc 58: 385-399.
Espmark, Y., Amundsen, T., & Rosenqvist, G. (Eds.). (2000). Animal signals: signalling and signal design in animal communication. Tapir Academic Press.
Gerald, M S. (2001). Primate colour predicts social status and aggressive outcome. Animal Behaviour, 61, 559-566.
Grueter CC, Zhu P, Allen WL, Higham JP, Ren B, Li M (2015) Sexually selected lip colour indicates male group-holding status in the mating season in a multi-level primate society. R Soc Open Sci 2:150490. doi.org/10.1098/rsos.150490
Setchell JM (2015) Color in competition contexts in non-human animals. In: Elliot AJ, Fairchild MD, Franklin A (eds) Handbook of color psychology. Cambridge University Press, Cambridge, pp 546-567.
Young, et al. (2020). Male characteristics as predictors of genital color and display variation in vervet monkeys. Behavioral Ecology and Sociobiology, 74(2), 1-14.
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[@jenn_willey]

Wearing that blue hat was a power move

[@guillaumekirouac1894]

So glad I found your channel!! Please make more videos like this!

[@abzde]

Fascinating stuff