# Warning Before a Fight: The Role of Distance and Ritualized Agonistic Behaviors in Minimizing Aggression in the Jamaican Fruit Bat

## TL;DR

Jamaican fruit bats use warning behaviors and distance to avoid fights when competing for mates in caves.

## Contribution

The study shows that male bats react based on rival distance, not harem size, during mating competition.

## Key findings

- Dominant male bats react faster when rivals get too close, indicating a minimum tolerable distance.
- Harem size does not influence the dominant male's response to satellite males.
- Encounters follow a sequence from ritualized displays to physical aggression.

## Abstract

Animals often compete for mates, and these contests can turn violent. Fighting, however, is risky and can cause serious injuries. To avoid this, many animals use signals and displays to warn rivals before attacking. We studied this process in the Jamaican fruit bat (Artibeus jamaicensis), a species where one male defends a group of females inside caves. By watching videos of these bats, we found that the distance of rival males matters; when they get too close, the defending male reacts quickly to chase them away. The number of females in the group did not change the males’ response. These encounters usually follow a precise sequence, beginning with warnings and sometimes ending in fights. Our study reveals how bats manage conflict and reduce the risk of injury.

In many vertebrates, ritualized behaviors serve to settle conflicts while minimizing the risk of injury. The Jamaican fruit bat (Artibeus jamaicensis) is a polygynous species that roosts in caves, where dominant males form and defend harems by displaying agonistic behaviors against satellite males attempting to mate with females. We examined how the distance of satellite males from the harem and the number of females influenced the latency of approach by dominant males during agonistic encounters, and whether these encounters follow a defined behavioral sequence. We analyzed 50 agonistic interactions from video recordings of A. jamaicensis harems collected between May and October 2021 in “Cantil Blanco” cave, Veracruz, Mexico. We quantified the number of females per harem and measured the distance of satellite males to the nearest female just before the dominant male initiated an approach. Our results show that satellite male distance determined dominant male approach latency, reflecting a minimum tolerable distance, whereas harem size had no effect. Furthermore, the succession of behaviors observed indicates that these encounters are sequential, escalating from ritualized displays to physical aggression.