They are part of the Mariner's Point colony of cats. I'm slowly making my way to all of the feral cat colonies in the Bay area to shoot photos. I'm trying to put together a photo book that can be purchased where all proceeds go to the Homeless Cat Network Organization which I volunteer for. The kitties are not always that easy to shoot since they are scared of people so, this project could take me a while :)
Incidentally, this colony had the friendliest bunch of cats I've encountered so far. I plan on going back to this site soon to shoot some more.