Evasion: When the Squirrel is subjected to an effect to make a Dexterity saving throw it instead takes no damage if it succeeds and half damage if it fails. Can't use while incapacitated.

Coordinated Attack: When the squirrel uses its Helpful feature to aid an ally in attacking a creature, the squirrel can deal an extra 2d6 damage to it the next time the squirrel hits.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 1d6+ 6 piercing damage. 

Cunning Help: the squirrel can take the Help, Dash, Disengage or Hide action as a bonus action, the creature who receives the help also gains a 1d6 bonus to the d20 roll. If that roll is an attack roll it can add it to the damage.