Anonyme, « When the worm is a mason », The Technical World Magazine, Chicago, Armour Institute of Technology, février, vol 22, n° 6, 1915, p. 860.
When the worm is a mason
Building a structure of masonry as hard as stone, the caddis worm hides effectively from fish which would find it tempting morsel. The little larva has a soft body which is much appreciated by minnows and so, with astonishing skill, it gathers stones and matches them together, completeting the whole with cement. The job is done under water and the cement holds firmly after a short time. Then it is almost as easy to crush the little building as it to break it apart. Naturalists have watched the construction job by prodding the caddis from its home and making it rebuild but always the little worm succeeeds in matching the stones.