Armor Class 13 (natural armor)
Hit Points 68 (8d10 + 24)
Speed 20 ft., swim 40 ft.
Skills Perception +3, Stealth +4
Senses passive Perception 13
Languages —
Challenge 2
Hold Breath. The plesiosaurus can hold its breath for 1 hour.
Bite. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 14 (3d6 + 4) piercing damage.
Monster Manual (2014), p. 80