What is a clear sign of starvation in a bee colony?

A clear sign of starvation in a bee colony is the observation of dead bees piled deep on the top bars. This behavior occurs because when bees are unable to find enough food, they will eventually die from lack of nourishment. These dead bees often accumulate in the upper parts of the hive, particularly near the frames where food sources are found. The presence of a significant number of dead bees in this area indicates that the colony has reached a critical point of starvation.

In contrast, the other options may suggest different issues within the colony. For instance, bees attacking neighboring colonies could be related to resource competition, but not specifically starvation. Swarming behavior, on the other hand, typically indicates a strong and healthy colony that is looking to reproduce, rather than one that is malnourished. High levels of aggression may be due to various stressors within the hive, such as overcrowding or disease, rather than a direct sign of starvation. Understanding these behaviors helps beekeepers identify and respond to the needs of their colonies effectively.