Keen Hearing and Smell. The weasel has advantage on Wisdom (Perception) checks that rely on hearing or smell.
Actions
Bite.Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 1 piercing damage.
Running this fight? Add the weasel to the initiative tracker: type its name and the AC, hit points and initiative bonus fill in, and the book button shows this stat block mid-fight.