I'm in South San Francisco. There used to be over a dozen feral cats in the neighborhood that would frequent my back yard. All but one disappeared recently in a short period of time. There were many reports of a wolf in the neighborhood, one time seen on my block. Likely the wolf got all the feral cats. Similar thing about other animals, used to get dozens of racoons, some 'possums and skunks going through our back yards. They started disappearing also with just a few remaining.
A couple years ago my neighbor's golden retriever was attacked by a hawk, which tried unsuccessfully to carry away the dog. Dog got some nasty wounds on her back that had to be stiched up. So yes, human populated areas are seeing an influx of predators not so afraid of humans. Message is to keep toddlers and babies safe from them.
There is a reason for larger numbers of predators. It is called Rewilding - part of agenda 21. Increased predation is deliberate, malicious, and under the control of puke liberal groups like The Sierra Club.
http://www.sweetliberty.org/issues/rewilding/
I’m farther down the peninsula from you. We used to see the occasional possum and lots of raccoons in the yard, too. But, one that you mention it, I haven’t seen any of them in years. Plenty of squirrels, still.