[eng] Bats are a very diverse group that occupies high levels of the food net. They are especially sensitive to environmental changes, which makes them good indicators of the environmental health of the territories in which they live. Chiroptera are of great interest in epidemiological studies because they are important reservoirs of emerging viral zoonoses. The present work shows ecological and epidemiological information of the Natural Park of the Peninsula de Llevant obtained from the analysis of the ultrasonic calls from bats and the analysis of the coronaviruses of guano. Seventeen localities were sampled in 2020 and 28 in 2021. The results obtained indicate that the Natural Park has a high diversity of bats, with the presence of 12 species and the most abundant being Pipistrellus pipistrellus, Pipistrellus kuhlii and Tadarida teniotis. The study also shows that localities with water have a higher number of species and higher bat activity. The environment with the least diversity and activity is the underground. Clogging of the mouths of some potholes due to the growth of vegetation or the placement of wood to prevent possible falls of people or animals are alterations that can have a negative impact on bat populations. Alpha and betacoronavirus positive samples have been obtained in several bat colonies. This is the first time that a beta-coronavirus has been found in bats from the Balearic Islands. Although the viruses detected are not zoonotic, it is advisalbe to take preventive measures and avoid contact with guano.