The Swarm Beekeeper's bees popping bloons they attach to in BTD4HD.
Bee is a status effect characterized by the use of a bee to damage bloons and slowly deal damage to them. It is part of the damage types family. It has appeared since Bloons TD 5, its subsequent iterations, and Bloons TD 4 Mobile with the introduction of the Beekeeper.
Bee is represented on Bloons Wiki as 
, the projectile for the Beekeeper in Bloons TD 4 Mobile, which appears to be a bee.
Bloons with a Bee attached to it will slowly be dealt damage every few milliseconds. Unlike Corrosive Glue, it does not slow down targets and it only carries over to 1 child bloon instead of all of them. Bees also deal Sharp 
damage, so they cannot latch onto Lead Bloons or Frozen Bloons. Each Beekeeper tower also has a limit on how many bloons they can affect with bees; when a bloon with a bee is completely popped, the bees can be visually seen returning to their parent Beekeeper. Unlike Glue 
and Freeze 
effects, Blowback 
does not remove bees on affected bloons.
The only tower/agent to have the Bee status effect is the Beekeeper.
