Winged Creature (5e Template)
From D&D Wiki
Sometimes, a creature that normally wouldn't be able to fly gains the ability to do so, whether by magic or some mundane means. The wings look natural for a creature of that kind, for example, a winged wolf would have feathered wings, while a winged lizard would have draconic wings. They tend to be a tad more agile than others of their kind, however.
Any creature that doesn't have a flying speed.
Abilities. The winged creature's Dexterity score increases by 1.
Speeds. The winged creature has a flying speed equal to the higher of its highest movement speed or 30 feet.
Adjust effective amour class, per DMG p. 279, if the creature has a challenge rating of 10 or lower and can deal damage at range.