I dont know how the hordes get pulled. Probably 2 different codes to deal with local/regional sound effects, but I know that its pretty hard to hear a sound 8 parroter from the next tile over.
As in, migo are parroters. they speak from a predefined list of text at predetermined loudness. like 50 irrc, something loud enough to hurt.
a sound 8 parrot is usually not heard. your footsteps are sound 6, I suspect only good_hearing mons can hear that.