How vampire bats build life-saving friendships through grooming and blood-sharing
In short: Vampire bats don't just hunt; they navigate complex social landscapes. New research suggests these blood-sucking mammals build trust through a tiered system of altruism, starting with low-cost grooming before progressing to the high-stakes act of regurgitating blood to save a starving partner.
A study published on March 19 in Current Biology reveals that common vampire bats (Desmodus rotundus) develop social bonds through a process that mirrors human friendship. Researchers from Ohio State University, led by behavioral ecologist Gerry Carter, found that these bats use a 'raising the stakes' strategy. This ecological theory suggests that animals test the waters of altruism using low-cost behaviors—such as grooming each other's fur—before committing to more costly investments, like sharing food.
To observe these emerging bonds, scientists captured 27 common vampire bats from two different sites in Panama. In laboratory settings, they monitored how these individuals interacted when food was withheld from certain bats. After 15 months, the data showed a clear hierarchy of social interaction: grooming always preceded food-sharing among strangers. While many strangers eventually established grooming relationships, significantly fewer progressed to the stage of regurgitating blood to provide a meal to a partner.
These blood-sharing acts are often reciprocal, meaning bats are more likely to feed a partner who has shared with them previously. Curiously, social settings matter; bonds among strangers frequently developed in the absence of known bats. While these findings offer insights into the complexities of social behavior, researchers also look to these mammals for medical breakthroughs. For example, researchers discovered peptides in common vampire bat (Diphylla ecaudata) venom that regulate blood pressure, potentially aiding hypertension or heart failure treatments.
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Sources
- Summary by Intellect · source: New Cancer Drug Results and Vampire Bat Friendships
- Also: How vampire bat friendship is surprisingly like our own
- Also: Vampire bat venom could hold key to new medical treatments | ScienceDaily
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