Buzz
Vampire bats demonstrate remarkable generosity among their social circles. During times of scarcity, they ensure their peers are nourished by regurgitating blood meals. However, this sharing isn't indiscriminate, as revealed in a recent study published in Proceedings of the Royal Society B. These bats meticulously remember past interactions and reciprocate based on prior generosity.
Vampire bats survive solely on blood, with females forming social groups of up to 12 members. These groups, as previous research indicates, often include unrelated individuals who assist one another. The latest study by researchers from the University of Maryland and the Smithsonian Tropical Research Institute highlights that food sharing among these bats is not arbitrary but based on reciprocity.
To understand how bats choose their food-sharing partners, the researchers observed captive bats under conditions where some were deprived of food, and key donors (including relatives) were removed. They discovered that bats who had previously shared more with non-relatives were more likely to receive food during fasting periods and in larger quantities. Bats also had preferred donors—such as a mother and daughter pair—who prioritized each other. When primary donors were unavailable, hungry bats turned to other partners, with past generosity increasing their chances of receiving food.
Interestingly, the bats also exhibited efforts to mend relationships. Some bats, previously unable to share during fasting periods due to lack of food, attempted to regain favor with more generous partners by significantly increasing their food-sharing efforts.
The study highlights the intricate social dynamics of bats, revealing their ability to meticulously track sharing behaviors over extended periods and determine whom they are willing to assist in times of scarcity.
