Imagine a Dark evening in summer and listening to the crickets singing. They have a rhythm that is repetitive but pleasant. Robi Robertson made an album and on it was a piece that had a recording crickets singing however they turned the speed way down low so that it sounded more like angels. How would we know that if not for the astuteness of their sound technician.
How much of our relations with animals and other living things do we not understand because of such imperceptible ways of communicating?