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There are two in Australia also but they don't have a "Brown Snake" but do have the Brown Tree Snake and the Slate-Brown Snake in addition to those two snakes they have the Children's Python...

I hate to argue with someone who obviously know his way around snakes and outbacks but...
...Olive Python...

That's almost brown.
...Speckled Brown Snake, Peninsula Brown Snake, Ingram's Brown Snake, Ringed Brown Snake, Western Brown Snake or Gwarder, Common or Eastern Brown Snake...

Aww, come on - there are loads.
I live in the greater San Jose Bay Area too, and every time someone even spots a hunk of what ... a coupla blocks. Perhaps the western hill mountain lions are more visible than the ones up behind the east bay?

Might be the topography. Sea, hills, I-280, towns, 101, Bay all running parallel like stripes West to east. When the cats come out of the hills they end up on the freeway (one killed soem months back, someone saw another 2 mths ago). If they cross the 280 theyre in some town or other. looks like cover but its someones yard.