Results from detection experiment. Estimated rates of detection by human ‘predators’ of images of black (black circles), grey (open circles) and striped (grey circles) Tetrix subulata pygmy grasshoppers presented on a computer screen against images of natural unburned greenish (0% burnt), intermediate (50% burnt) and totally burned (100% burnt) visual backgrounds. Average percent detected grasshopper images (a). Average time to detection based on data for only those images that were detected (b). Figure shows mean ± s.e. Means with different letters are significantly different, as revealed by Student-Newman-Keuls a posteriori pair-wise comparisons of colour morph group means within each background.