Evolutionary trade-offs may interact with physiological constraints to maintain color variation

- kestrel and snake ocular media data are not provided within data folders since obtained from external sources - directory structure: codes and datasets are split into 3 main folders: 1) "Codes-Experiments" = codes and data in reference to behavioral experiments 2) "Codes-Pictures" = all codes and data for analyses in which color data obtained from digital images were used 3) "Codes-Specs" = all codes and data for analyses in which color data obtained from spectrophotometry were used - additional analyses / figures for response to reviews are found in folder "revisions"