To extrapolate a little more on this...
If you have a superior sense of hearing, you don't need to bang on trees, clack rocks together and bellow in the night, do you? Has there ever even been a description of the visible outer ear structure of a WA? Not too many, if at all. I mean, they have to have ears, but they are not exactly proportional, are they?
If you have a superior sense of smell, do you need the B.O. that is consistently reported? Nah, you would rely on pheromones to communicate with your kind, not an in-your-face-eye-watering funk.
So what remaining sense is there on the menu if you want to succeed as a species?