Figure 2.

Each egg in each clutch was digitally photographed after being visually scored based on three parameters: maculation intensity (darkness), maculation spread and background pigmentation darkness. Scores for each parameter ranged from 0, representing the lower extreme (very pale maculations, very concentrated maculation spread, very pale eggshell background), to 5, representing the upper extreme (very dark maculations, dispersed maculations, very dark eggshell background). The scores for each category were added to create a total score for each egg, which was then averaged over the clutch. Higher scores denote more-pigmented or darker clutches; lower scores indicate less-pigmented or lighter clutches.