The "rocks" all have openings near the bottom and are apparently supplying condos for homeless cats. I hope this is part of a catch, spay and release program.
The ducks are not that interested in my company, I am sorry to say. Neither are the denizens of Cat Town. That does not keep me from trying to creep up on them as a handy way to put off getting on my bicycle and peddling off into the wind in 103 degree temperatures.