However, rather than try to place the Viceroy in a rigid, all-or-none category which implies more than the data show, the Viceroy is here considered more edible than its model, the Monarch, but initially less edible (except to C-2) than the non-mimetic butterflies used in these experiments.
1957, Jane Van Zandt Brower, “Experimental Stdies of Mimicry in Some North American Butterflies”, in Lynne D. Houck, Lee C. Drickamer, editors, Foundations of Animal Behavior: Classic Papers with Commentaries, published 1996, page 81