A new study published in the revista Behavioural Ecology find that ‘vampire bats’ lay down social distance between them when they are sick, in order not to infect others.

For research, scientists infected half of 31 bats female from the same group living in a community in Belize. The other half were injected with plain placebo saline and all units were marked with a locating device.

In the following days, the researchers verified that the 16 sick individuals they spent much less time with other bats of their group who were healthy.

Thus, the study also found that the designated “control” bat had a 49% chance of socializing with healthy individuals of their kind, and only 35% of doing so with those who were sick.