I immediately noticed tasmanian devils on the sign as well. I would think if they put it on the public sign like that it is a pretty sure thing. (And if anyone could pull of getting rarities, it is San Diego).
I have only seen them once - I think it was in the mid 90's at the Cincinnati Zoo - and I could not get any good photos. (If I had known I would not see them again in the United States, I might have tried harder).