I live in a similar biome to you. I do see the occasional one on my travels - even left the house @11pm for one a couple of nights ago.
I won't say they are common, but I have been lucky enough to see a few.
I am just going to assume you got lucky, and that they were always around just in such small numbers that you haven't had the luck before now.
Congrats!
...may you find many more.
