highly significantP<0.001
The inclusion of PC SIZE as a covariate in the model comparing bill depth between populations still resulted in highly significant differences (GLM: PC SIZE : F [1;281] = 23.2, P<0.001; Sex: F [1;281] = 2.3, P = 0.130; Population: F [3;281] = 190.2, P<0.001; Sex vs.