Multiattack

The couatl makes one Bite attack and one Constrict attack.

Bite

_Melee Weapon Attack:_ +7 to hit, reach 5 ft., one creature. _Hit:_ 8 (1d6+5) piercing damage plus 14 (4d6) poison damage. If the poison damage reduces the target to 0 HP, the couatl can choose for the target to be stable but poisoned for 1 hour, even after regaining HP, and is unconscious while poisoned in this way.

Constrict

_Melee Weapon Attack:_ +7 to hit, reach 10 ft., one target. _Hit:_ 12 (2d6+5) bludgeoning damage, and the target is grappled (escape DC 15) if it is a Medium or smaller creature. Until this grapple ends, the target is restrained, and the couatl can't Constrict another target.

Healing Hiss (3/Day)

The couatl croons a soothing hiss at a creature it can sense within 5 feet of it. The target magically regains 10 (3d6) HP and is freed from any disease or poison.