I was about to throw out some old flowers I had picked on the side of the road when I noticed a caterpillar on one of the old Queen Anne's lace. It turns out that Black Swallowtail butterflies like to eat the parsley family which includes that flower. So I am hanging on to the cluster of broken down flowers, and am going to see what develops.
They eventually look like this.
You can see from the first picture that caterpillars are not the only insects in our house.