figure 4 in EFfects of background color on pigmentation, morphological traits, and behavior in the European tree frog (Hyla arborea, Hylidae, Anura) tadpoles

figure 4 The tadpole body coloration by treatment: day 0 – the start of the experiment, average pigmentation 69% of dark pixels, no treatment groups; day 20 of the experiment (day 20) – two treatment groups, Dark and Light, average pigmentation d – 93% and l – 62% of dark pixels; day 36 – the end of the experiment (day 36) – four treatments, dd – dark-dark treatment, ld – light-dark treatment, dl – dark-light treatment, ll – light-light treatment, average pigmentation dd – 90%, dl – 60%, ld – 91%, ll – 70% of dark pixels.