There is little doubt as to the winner

G. Kiddell, Walks and Talks, Londres, Sir Isaac Pitman, 1927, p. 31-32.

  1. Try very gently to draw the grub of the Caddis from its case, or to push it out with a grass stem. It seems to cling to something inside. There are two curved hooks near the end of its tail, and with these it firmly clasps the sides.
  2. Some of these Caddis build their houses of grains of sand, stuck together with a cement of their own making, and sometimes they use leaves, and even tiny shells with snail inside. Now and then there is a tug-of-war between these snails, and it is great fun to watch them and see who wins . When the Caddis it self takes part, there is little doubt as to the winner.
  3. Our Caddis worm was once a tiny green egg in a spot of jelly, fastened to the leaf of some water plant. Then one day, thanks to the kindly warmth of the sun, it became a worm, but, being soft and juicy, it was afraid of being eaten by a hungry fish or beetle, and so it made itself this case.
  4. Inside this case it grows fatter daily by earting lots of green food, until presently it is tired and can eat no more, and the nit retires to rest. Its bedroom is a silken cocoon, which has a cunning grating over each end to keep out unwelcome visitors, and let fresh water flow in and out freely.
  5. One fine sunny day the little thing awakes, slowly crawls or floats to the surface, and comes quite out of its cocoon as a Caddis fly. For a little while it rests upon the outside of its case, which floats like a raft on the water, while its four gauzy wings dry.