Table 1. Comparison of color distribution among caterpillars fed willow branches with intact leaves and caterpillars fed birch branches with intact leaves, or crab-apple leaves on birch vs. willow branches.

Treatment		Color Score				G-statistic	P
		A	B	C	D
Intact leaves	Willow-fed	152	176	56	20	744.64	<0.001
	Birch-fed	0	15	69	364
Crab-apple leaves	Willow-branches	44	120	139	124	501.7	<0.001
	Birch-branches	0	2	13	420

Scoring was based on 1 = green, 2 = green intermediate, 3 = brown intermediate, 4 = dark brown.