The mealworms are full-fledged beetles these days. They are very active and run all over the place in their container. They like the potatoes and they are good at crawling all over them, which was a big difference from the last time I observed them. They look like a typical beetle. They are black or a dark redish-brown. They kind of have a shell on their back. They have wings although they don't fly.

The beetles are a little less wary of people than the mealworms were. They do not get disturbed as easily, and seemed to do okay when I cleaned out their container (They ran from me rather than playing dead.) They seem to be able to survive in tough conditions, including with mold, etc. Most of the them were still alive when I cleaned them out.