The picture at the right

W. L.Beauchamp, G. O. Blouch & M. Melrose, Discovering our Wold, A Course in Science for the Middle Grades, 2, Toronto, W. J. Gage, 1940,  p. 328

The picture at the right, below, shows a caddis worm which lives in the water, in a house that it carries around with it ! It builds this house, or case, of sticks and leaves. The case looks so much like the bottom of the stream that enemies of the caddis worm are not likely to see it.