While our little red wiggler friends are busy making eating and excreting castings, there are lots of fun things to learn about them. I will try to find interesting websites and videos that will enhance your learning about worms. Today, I thought it would be cool to learn a little bit about worm biology!
Worms (annelids) are different than we are, in that they have a hydrostatic skeleton. Did you know that? It means that they can move much more fluidly than we can, although I’ve seen some dancers, who were quite flexible. Worms are actually filled with fluid and muscles that apply pressure within their wormy cavity to move. To move, they use teeny bristles (chaetae, pronounced, ‘keetay’). A hydrostatic skeleton is pretty amazing as it means the organism can decrease in diameter while increase in length, which I’m sure you’ve experienced with worms. For a more scientific explanation, see http:youtu.be/n0QF50BbG1k. The video is interesting–you just can’t imagine what’s inside a worm!