The mystery rodent of late August has been identified. R.I.P. Rattus rattus, who was found floating in the swimming pool today, dead. This is annoying, because they are the attic-invading, wire-chewing sort of rats. It's time to alert the neighborhood.
Rattus rattus, the "black rat" has recently invaded Phoenix, where the abundant citrus drop in some suburbs provides it with food. You can discourage them by meticulous attention to cleaning up dropped fruit and clutter that provides them with habitat.
I have compost heaps, a woodpile, tomato jungles, and many seed-bearing plants. This is not going to be easy. At least I only have one citrus tree left.