I'm always reluctant to assume a particular selective pressure for every biological trait[1], but for a species that puts up a large feather train and does an e

I'm always reluctant to assume a particular selective pressure for every biological trait[1], but for a species that puts up a large feather train and does an elaborate dance with it to attract a mate, my prior would be really really low on that just being a coincidence. In the case of the 2008 study the parent poster linked, they got null results but it appears based on more recent research they just weren't investigating the relevant parameters, which was improved later on the field with a better understanding of peahen vision and the biomechanics of the feather shaking dance. 1 see: spandrels https://wikipedia.org/wiki/Spandrel_(biology) https://wikipedia.org/wiki/Spandrel_(biology)