The owl has always represented the dark, the occult and the defiance of natural order. Nocturnal means active or operating at night. An owl prays upon their unsuspecting victims in the dark and unseen from above. Who, Who, Who, would ever think the owl represented anything good?
https://aeon.co/ideas/to-see-the-antisemitism-of-medieval-bestiaries-look-for-the-owl