I'd say wherever evolution can occur, if the resources and environment are complex enough, intelligence must eventually also occur. Intelligence just means high-order processing, and this is clearly linear rather than punctuated-- i.e. there's no critical mass at which pop! intelligence pops into the system.
I suspect that to a highly intelligent species, we may not be all that, after all. We are pretty biased.
I suspect that to a highly intelligent species, we may not be all that, after all. We are pretty biased.