Swimming Creatures Lesson 11: Echinoderms

Last week we covered the wonderful world of spiny skinned creatures, otherwise known as echinoderms. These benthic creatures which have no eyes, no brain and tube feet include Sea Stars, Brittle Stars, Crinoids, Sea Urchins, Sand Dollars, and Sea Cucumbers. Notebooking assignments included making a notebook page for each of the following animals: sea stars, brittle stars, crinoids, sea urchins, sand dollars and sea cucumbers. Today, we finished up by doing a project with salt water to create salty brittle stars by crystallizing salt.
We boiled some water, added food coloring, and then made a saturated salt water solution. Then we added some cotton yarn tied to together to make a star shape and we are waiting for salt crystals to form into a salty brittle star!
*Update: Here is our salty brittle star after only 2 days!


  1. HI! I gave u an award! Collect it at my blog!

  2. I love this series-I have the Astronomy and the Flying Creatures. I look forward to the boy working thru these so I can get the swimming one! Nice post.

  3. Hope you post pics of your star when it's finished....looks fun!

  4. I added picture of our salty brittle star. :-)