Possibly.
The only thing we know for sure is a:
they hear in a quadraphonic set up,
they can see for sure in the same range we do,
they can see in a range of unknown bandwidth we can't (avp, alien, alien3, a:r)
and that echolocation and pheromones would be secondary sets at best, if at all, because neither works in closed environments and contrary to popular belief, pheromones are shit for hunting, only useful for determining on site states of being,
and they have some kind of means of tracking stuff at long distances through very very shielded materials, as long as it isn't small girls.
http://gamegossip.com/forums/showthread.php?t=21653