Shapechanger. The Couatling can use its action to polymorph into a beast form that resembles a Giant Fire Beetle (speed 30 ft.), a hawk (20 ft., fly 60 ft.), or a lizard (20 ft., climb 20 ft.), or back into its true form. Its statistics are the same in each form, except for the speed changes noted. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Innate Spellcasting. The Couatling's spellcasting ability is Charisma (spell save DC 11). It can innately cast the following spells, requiring only verbal components:

1/day each: detect magic, cure wounds, sanctuary

Shielded Mind. The Couatling is immune to scrying and to any effect that would sense its emotions, read its thoughts, or detect its location.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 10 (3d6) poison damage on a failed save, or half as much damage on a successful one.

Scare (1/Day). One creature of the Coatling's choice within 20 feet of it must succeed on a DC 11 Wisdom saving throw or be frightened for 1 minute. The target can repeat the saving throw at the end of each of its turns, with disadvantage if the Coatling is within line of sight, ending the effect on itself on a success.