Some bees “shimmer” by flipping their abdomens up in coordination with other bees. This seems to deter approaching predators and lost bees from other hives.
The behavior “is intriguing as this is possibly one way in which a species of animal communicates with another to warn that they are capable of defending themselves,” says Kavitha Kannan, a neurobiologist at the University of Konstanz in Germany who was not involved in the study., typically form open nests uncovered by other materials in areas like tree branches and window ledges. In the new study, the researchers worked with twonests in roof rafters.
The team observed little shimmering during the dim twilight periods of dawn and dusk. Since shimmering is a response meant to be perceived by a predator or other unwelcome visitor, such as a bee from another colony, the researchers think that other defensive behaviors might be at play during dim conditions., send waves cascading across their open nests by flipping their abdomens upward in a coordinated motion. The behavior seems to deter bee predators such as hornets.
In both hives, shimmering completely vanished when the bees were presented with the smallest objects, in this case a circle four centimeters in diameter. The result suggests that there is a minimum size threshold that triggers the ripples.
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