I don't think I'll ever get tired of watching the caterpillars. They are so funny! For instance, all the caterpillars gang up on a single milkweed plant, demolish it, and move on to the next one. A couple days ago, there were so many on a flimsy little plant, that the weight was making it tip over!
I would also like to draw your attention to the "leaf" below. This is what the eensy caterpillars do to their milkweed leaves. The big ones eat the whole thing, flower, stem and all. Pigs.