Mr.
H.O.Forbes has described a most interesting example of this kind of simulation in Java.

While pursuing a large butterfly through the jungle, he was stopped by a dense bush, on a leaf of which he observed one of the skipper butterflies sitting on a bird's dropping.

"I had often," he says, "observed small Blues at rest on similar spots on the ground, and have wondered what such a refined and beautiful family as the Lycaenidae could find to enjoy, in food apparently so incongruous for a butterfly.
I approached with gentle steps, but ready net, to see if possible how the present species was engaged.

It permitted me to get quite close, and even to seize it between my fingers; to my surprise, however, part of the body remained behind, adhering as I thought to the excreta.

I looked closely, and finally touched with my finger the excreta to find if it were glutinous.