An owly rump, a rumpy owl

Now you can add one more to your stock of bird phrases (birds of a feather flock together, don't count your chickens, a bird in the hand, the early bird catches the worm, one swallow does not a summer make, what's good for the goose etc. etc.)

'A NEVER DAY WHEN THE OWL BARES ITS RUMP'

which means that it (whatever it is) is absolutely never no way going to happen.

Thank you, distinguished Russian literary theorist Mr Roman Jakobson, for bringing this one to our attention.