Table 4. Comparison of color distribution among caterpillars fed willow vs. birch leaves on intact branches either for their entire life or transferred at a particular larval instar.

Treatment	Color
	Brown	Intermediate	Green
Control on birch (brown)	7	0	0
Brown to green, instar 5	0	1	11
Brown to green, instar 6	11	3	0
Control on willow (green)	0	0	6
Green to brown, instar 5	9	2	0
Green to brown, instar 6	0	1	11