highly significantp < 0.0001
Results White-squid coloration changing according to substrate Our selected mathematical model revealed a highly significant interaction between the fixed effect of substrate (Fig. 3 ) and all the measured RGB color channel values (p < 0.0001) on the head that appear all highly positively correlated with each other and with the mantle (r > 0.94, p < 0.0001; Supplementary Table 1 ) and matching the destination substrate (Fig. 4 ).