« Masking » is another instinctive type of bluff

Lilo Hess, Animals that hide, imitate, and bluff, New York, Scribner, 1970, p. 58.

« Masking » is another instinctive type of bluff some creatures have devised to fool their enemies. The larva of the caddis fly, which lives in streams or pond, has a soft, vulnerable body. To escape detection it construct around its body a tube of silk, to which it fasten bits of leaves, tiny stones, stems from water plants or small twigs. Each species makes its particulat type of shelter from material it finds in the place in which it lives. Some roll leaves into tubes around their bodies, some build little houses out of sand, while other species conceal their soft, worm-like bodies in tiny « log cabin » constructions.