Constrict - Constrictor Snake

Monster Manual - 5e, D&D Basic Rules

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.