Stirge

Melee Weapon Attack: +5 to hit, reach 5 ft.. Hit: 6 (1d6 + 3) piercing damage. If the target is a creature, and the stirge attaches to the target. While attached, the stirge can't make Proboscis attacks, and the target takes 5 (2d4) necrotic damage at the start of each of the stirge's turns.
The stirge can detach itself by spending 5 feet of its movement. The target or a creature within 5 feet of it can detach the stirge as an action.