Couatl hatchling

Flyby. The Couatl 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.

Bite: Melee Weapon Attack:  +3 to hit, reach 5 ft., one target. Hit: (1d1) piercing damage

Change Shape. The couatl magically polymorphs into a humanoid or beast that has a challenge rating equal to or less than its own, or back into its true form. It reverts to its true form if it dies. Any equipment it is wearing or carrying is absorbed or borne by the new form (the couatl's choice). In a new form, the couatl retains its game statistics. but its AC, movement modes, Strength, Dexterity, and other actions are replaced by those of the new form, and it gains any statistics and capabilities (except class features, legendary actions, and lair actions) that the new form has but that it lacks. If the new form has a bite attack, the couatl can use its bite in that form.