Birbee

Keen Sight. The birbee has advantage on Wisdom (Perception) checks that rely on sight.

Pack Tactics. The birbee has advantage on attack rolls against a creature if at least one of the birbee's allies is within 5 feet of the creature and the ally isn't incapacitated.

Beak. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) piercing damage.

Sting (2/Short Rest). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) piercing damage, and the target makes a DC 11 Constitution saving throw. On a failure, the target takes 5 (2d4) acid damage at the start of each of its turns. Creatures suffering the birbee's sting may attempt an additional saving throw at the end of their turns.