Beever

Pack Tactics. The Beever has advantage on an attack roll against a creature if at least one of the Beever's allies is pithing 5ft. of the creature and the ally isn't incapacitated.

Pheromone Sensors. A Beever is able to telepathically communicate with other Beevers within 1 mile and can locate the position of their Queen as long as they are on the same plane.

Keen Hearing. The Beever has advantage on Wisdom (Perception) checks that rely on hearing.

Insectoid Limbs. The Beever can climb any surface, including upside down on ceilings, without needing to make an ability check.

Hold Breath. The Beever can hold its breath for 15 minutes.

Wood Cutter. The Beever's bite attack deals double damage on creatures, objects and structures made of wood.

Powerful build. The Beever counts as one size larger when determining its carrying capacity and the weight it ca push, drag or lift.

Action Name. Enter the description for your action.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft.. Hit: 12 (2d8 + 4) piercing damage. 

Sting (Recharge 5-6). Melee Weapon Attack: +6 to hit, reach 10 ft. Hit: 9 (1d10 + 4) piercing damage and 6 (2d6) poison damage. The target must make a DC 14 constitution saving throw against being poisoned.

Tail-slap. Melee Weapon Attack: +6 to hit, reach 10 ft. Hit:  (1d6 + 4) bludgeoning damage.

Multiattack. The Beever make 3 male attacks, 1 bite attack and either: 1 tail-slap and 1 sting, or 2 tail-slaps.

Enter the description for how bonus actions work for your monster here.

Swarm Pheromones. When hit the Beever can use its reaction to release pheromones and a screech. This will alert Beevers in a mile radius about the incident and they will swarm towards the location.

Swarm Tactics. When attacked the Beever can use its reaction to call out to its allies within 5ft of the target to attack it with either a bite or sting attack.

Swarm Revenge. When an allied Beever uses it's Swam Tactics ability the Beever can use its reaction to act accordingly.