Armor Class 14
Hit Points 5 (2d4)
Speed 30 ft., fly 60 ft., swim 30 ft.
Senses blindsight 10 ft., passive Perception 11
Languages —
Challenge 1/8
Flyby. The snake doesn't provoke opportunity attacks when it flies out of an enemy's reach.
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 1 piercing damage plus 7 (3d4) poison damage.
Monster Manual (2014), p. 322