Armor Class 19
Hit Points 60 (8d8 + 24)
Speed 30 ft., fly 90 ft.
Saving Throws CON +5, WIS +7
Damage Resistances bludgeoning, piercing, slashing
Damage Immunities psychic, radiant
Senses Truesight 120 ft., passive Perception 15
Languages all; telepathy 120 ft.
Challenge 4
Shielded Mind. The couatl's thoughts can't be read by any means, and other creatures can communicate with it telepathically only if it allows them.
Bite. m +7, reach 5 ft. Hit: 11 (1d12 + 5) Piercing damage, and the target has the Poisoned condition until the end of the couatl's next turn.
Constrict. str DC 15, one Medium or smaller creature the couatl can see within 5 feet. 8 (1d6 + 5) Bludgeoning damage. The target has the Grappled condition (escape DC 13), and it has the Restrained condition until the grapple ends.
Monster Manual (2024), p. 82