5e SRD:Constrictor Snake
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Large beast, unaligned
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 5 (1d6 + 2) piercing damage.
Constrict. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 6 (1d8 + 2) bludgeoning damage, and the target is grappled (escape DC 14). Until this grapple ends, the creature is restrained, and the snake can't constrict another target.