Cheetah

Stalker. Cheetahs have advantage on stealth checks made to sneak up to a target.

Ambush Predator. When attacking from a concealed position with 60 ft. of a target the first attack has advantage.

Keen Senses. Cheetahs have advantage on perception checks related to hearing, and smell.

Bite Attack: +2 to hit, reach 5 ft. 1 target. Hit:  3d6 + 1 piercing damage. 

Claw Attack: +2 to hit, reach 5 ft. 1 target. Hit: 4d4 + 1 slashing damage.

Trip. Make a melee claw attack: +4 to hit, reach 5 ft. 1 target that has moved during its last turn. Hit: 4d4 + 2 slashing damage and the target is knocked prone.

Pounce. After moving 30 or more ft. in a straight line, make a bite attack against a target that is not focused on, or aware of, the cheetah's presence, with + 4 to hit and + 2 to damage. On a successful hit if the target is large or smaller it becomes grappled and is knocked prone. (Crit on 19-20)