Recently I’ve been trying to select education market projects that have something to do with nature, the environment, and environmental issues. One of the best of these was a project on biodiversity (Nomad Press, March 2019). I wasn’t even going to take on a project last spring, then that one landed in my inbox. I couldn’t say no. At every turn I was AMAZED by what my research uncovered. A lot of the cool things I found are in the book. But since the book needed to be less than a zillion pages, so many amazing organisms are not. One of those is the hermit crab. Not the ones that are in cages on the boardwalk at the beach. No, the ones living in the wild. They actually line up, BY SIZE, to trade shells. You can see this phenomenon in action on the BBC website – http://www.bbc.com/earth/story/20141103-hermit-crab