Data from: Using human vision to detect variation in avian coloration: How bad is it?

Assessing variation in animal coloration is difficult as animals differ in
their visual system properties. This has led some to propose that human
vision can never be used to evaluate coloration, yet many studies have a
long history of relying on human vision. To reconcile these views, we
compared the reflectance spectra of preserved avian plumage elements with
two measures that are humans biased: RGB values from digital photographs
and the corresponding reflectance spectra from a field guide. We measured
73 plumage elements across 14 bird species. The field guide reflectance
spectra were drastically different from that of the actual birds,
particularly for blue elements. However, principal components analyses on
all three data sets indicated remarkably similar data structure. We
conclude that human vision can detect much of the variation in coloration
in the visible range, providing fodder for subsequent studies in ecology,
evolution, behavior, and visual ecology.