Echolocation. The bat can't use its blindsight while deafened.
Keen Hearing. The bat has advantage on Wisdom (Perception) checks that rely on hearing.
Bite. Melee Weapon Attack: +2 to hit, reach 5 ft., one creature. Hit: 1d4+2 piercing damage.
Flyby. The owl doesn't provoke opportunity attacks when it flies out of an enemy's reach.
Keen Hearing and Sight. The owl has advantage on Wisdom (Perception) checks that rely on hearing or sight.
Talons. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 1d4+4 slashing damage.