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A large amount of wax debris (with no visible larvae), legs, wings, and pollen may indicate robbing.
A colony is robbed because its guard bees do not adequately defend the hive entrance.
The colony is too weak compared with the aggressor (population too small, disease, lack of queen pheromones, etc.).
Reduce the entrance size
Observe the hive entrance: if the guards are unable to repel the robbers effectively, the hive should be moved.
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