Figure 4. Mean achromatic and chromatic contrast values for model snake used in on predation study on limestone and volcanic rock.

Contrast values given in just noticeable differences (JND) for comparisons of limestone and volcanic rocks to the two base model colors of our study (see Figure 2). Model type is listed on the x-axis with Eastern Model referring to the model color mimicking snakes from the eastern region in areas of limestone, while Western Model refers to the model color mimicking snakes from the western region on volcanic rock. Different letters above bars indicate significant differences between contrast values for limestone and volcanic rock for the individual model types.