Chupacabra

Pounce. If the Chupacabra moves at least 30 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 13 Strength saving throw or be knocked prone. If the target is prone, the Chupacabra can make one bite attack against it as a bonus action.

Multiattack. The Chupacabra makes two attacks: one with its bite and one with its claws. It can't make both attacks against the same target.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 14 (2d10 + 4) piercing damage. If the target is a Medium or smaller creature, it is grappled (escape DC 13). Until this grapple ends, the target is restrained, and the Chupacabra can't bite another target.

Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) slashing damage.

Leech.  When a creature is restrained by the Chupacabra's bite attack, it can use an action to force the creature to make a DC 15 Constitution saving throw.  On a fail, the creature takes 2d8 Necrotic damage while the Chupacabra heals an amount equal to half the damage dealt, rounded up.  On a success, the creature takes half damage and the Chupacabra does not heal.