Vulture

Carrion Sense. The vulture can pinpoint, by scent, the location of carrion, dead creatures, and Undead without the Incorporeal Movement trait within 60 feet of it.

Heightened Sight and Smell. The vulture's Perception is 18 when perceiving by sight or smell.

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

Beak. _Melee Weapon Attack:_ +2 to hit, reach 5 ft., one target. _Hit:_ 2 (1d4) piercing damage.

Defensive Bile. When a creature the vulture can see hits it with a melee attack while within 5 feet of it, the vulture can spit partially digested carrion at the creature. The attacker must succeed on a DC 11 CON save or be incapacitated until the end of its next turn.