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1. May flies and caddis flies were on the wing.

2. Like a spider web or a caddis house, a beaver dam is among the true wonders of the world.

3. Caddis houses helped us take the previous step; snail shells will help us take this one.

4. The caddis house, nobody could doubt, is an adaptation, evolved by Darwinian selection.

5. Natural selection favoured those ancestral caddis genes that caused their possessors to build effective houses.

6. Yet caddis larvae, who do precisely that, command only passing interest.

7. But what about the caddis house? Natural selection favoured those ancestral caddis genes that caused their possessors to build effective houses.

8. The aquatic, wormlike larva of the caddis fly, enclosed in a cylindrical case covered with grains of sand, fragments of shell, and other debris.

9. Swarms of 20 different kinds of caddis fly emerge, providing a good source of protein for hungry birds, and bears still sleepy from hibernation.

10. He is also a founder and owner of Caddis Research LLC, which is developing antimicrobial agents that target bacteria that pose a threat to public health, and he is a consultant for Pfizer Research.

11. I was amused and relieved at the easily-remedied cause of the blockage: cased caddis larvae.

12. Any of various other flying insects, such as the caddis fly.

13. These ancient creatures are predominantly extinct ancestors of today's cockroaches, ants, termites , caddis flies, centipedes, crickets, scorpions and millipedes.

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14. At the end of that time, the team found higher populations of stoneflies, mayflies and caddis flies in the screened segments than in adjacent unscreened ones.

15. Although it may get you in trouble with your mother, the Caddis Fly hatch on Mothers day is legendary.

16. There he dies and is transformed into a "water baby", as he is told by a caddis fly and begins his moral education.