Table 2.

Results from t tests comparing mean RGB values of slugs against RGB values of substrate from their natural habitat, and against substrate from alternative habitats (sample sizes and means ± SD for each colour channel are presented in Table 1)

		Forested substrate			Bog substrate
	Channel	Mean diff.	t	p	Mean diff.	t	p
Forested slug	R	0.56	0.18	0.852	−57.60	−19.80	<0.001
	G	4.30	1.58	0.115	−46.68	−16.64	<0.001
	B	2.05	0.78	0.437	−38.22	−12.46	<0.001
Bog slug	R	58.51	21.28	<0.001	0.35	0.13	0.894
	G	47.69	18.03	<0.001	−3.29	−1.22	0.224
	B	36.15	11.91	<0.001	−4.13	−1.21	0.227