Keen Hearing and Smell. The Bido has advantage on Wisdom (Perception) checks that rely on hearing or smell. Improved Critical. Bido's attack rolls score a critical hit on a roll of 19 or 20 on the d20.
Extra Attack. Bido can attack twice, instead of once, whenever it takes the Attack action on its turn. Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: (1d6 + 4) piercing damage. If the target is a creature, it must succeed on a DC 15 Strength saving throw or be knocked prone
Second Wind. Bido can use a bonus action on its turn to regain 1d10+5 hit points. Once it uses this feature, it must finish a short or long rest before it can use it again.