Collect a large array of colorful poisonous and non-poisonous mushrooms; also capture a mushroom-eating animal, such as frog. Present a hungry frog with a choice of mushrooms that have been dyed or painted a drab poisonous and non-poisonous mushrooms color versus others treated with a solution that is identical to the dye or paint used but uncolored. Record which mushrooms the animal eats. Repeat the test with one more animal and the same mushrooms.