Guess what.. Yes, there are whispers in this song, too. Turn the volume up and listen closely, preferably with headphones. Between the two strange grunts(or is it a digeridoo or something?) you can hear a soft voice whispering a few sentences, beginning at 1:50. It doesn't make any sense at least to me and the language spoken definitely isn't English.
It is possible though, that it is in some language unknown to me. Portuguese again, perhaps. ;)