Keen sight: The Silverwing has advantage on Wisdom (Perception) checks that rely on sight. Swift swoop: The Silverwing cannot be targeted by attacks of oppertunity while flying.
Multi attack:
The Silverwing makes two attacks: one with its beak and one with its claws.
Beak.
Melee Weapon Attack +4
Hit: 6 (1d8+2) Piercing damage.
Claws.
Melee Weapon Attack +7
Hit: 8 (2d6+2) Slashing damage.
Silverwings are native to the Silver Mountains and haven't been found living anywhere else. However, they do tend to roam the surronding land when hunting.