To evaluate if long-term cooperative relationships in vampire bats play a role in foraging, we tested if foraging encounters measured by proximity sensors could be explained by wild roosting proximity, kinship, or rates of co-feeding, social grooming, and food sharing during 21 months in captivity. However, it remains unclear whether these cooperative relationships extend beyond the roost. Food-sharing relationships form via preferred associations and social grooming within roosts. A striking example is that female vampire bats often regurgitate blood to socially bonded kin and nonkin that failed in their nightly hunt. Stable social bonds in group-living animals can provide greater access to food.
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