In the old children's book I got, there's a story about caddis worms! It made me think of you:
Some caddisfly larvae find themselves born into a pond, but their white backsides make them very vulnerable. So one of them gets the bright idea to build houses to protect themselves. (At this point they all think they are very clever, not knowing that caddis worms have always done so).
However, the Biggest Caddis Worm builds his case carelessly, even though the others forewarn him to make sure it is thick enough. Eventually they fasten their houses onto something solid and enter a deep sleep. Soon, Water Adder comes over and bumps the Biggest Caddis Worm's house, and he tumbles out. Belostoma happens to be by and carries him off. None know just what became of the Biggest Caddis Worm after that. :sad:
That's so cool. :)
Full story here (http://www.mainlesson.com/display.php?author=pierson&book=pond&story=caddis&PHPSESSID=7d972c72273f98e6606f57879a8105c6)