According to Osho, nothing is to be learned from the cuckoo—just listen until the song, its echo, and even the listener dissolve into silent space. In that emptiness you become a nobody, tasting the same pure being shared by all buddhas. This egoless silence attunes your heartbeat with existence; beyond this, there is no other religion.
Listen to the cuckoo so deeply that the sound fades into quiet—there, without your usual ‘me,’ you feel the same peaceful life all awakened ones feel.