Fig. 2
From: Scleral appearance is not a correlate of domestication in mammals
Scleral brightness (approximated by greyscale luminance of the scleral portion of the externally visible eye and thus including the conjunctiva) in closely related wild and domesticated mammals. A Distribution of scleral brightness values in the studied species. Note that domesticated and wild forms of each species mostly resemble each other. B Paired boxplot showing scleral brightness in domesticated forms compared to their close wild relatives. C Plot of scleral brightness as a function of ocular diameter. Note that species with larger eyes tend to exhibit greater degrees of conjunctival pigmentation and thus lower scleral brightness