Which mammals live within the municipal territory of Trieste? Where are they concentrated? How numerous are they? For the first time, these questions can now be answered thanks to research coordinated by Alessio Mortelliti, Professor of Ecology at the Department of Life Sciences of the University of Trieste.

The study represents the first systematic survey ever conducted in the Municipality of Trieste on the presence, distribution and abundance of medium- and large-sized mammals. It fills a significant gap in knowledge about the city’s natural heritage and provides essential data for biodiversity conservation and land-use planning.

The research was carried out between November 2025 and February 2026 using a fully non-invasive methodology based on camera trapping. A total of 156 camera traps were installed across 78 monitoring sites distributed throughout the Municipality’s natural and peri-urban habitats, amounting to more than 2,300 observation nights. The cameras, automatically triggered by the passage of animals, made it possible to document wildlife presence without interfering with animal behaviour.

Overall, 18 mammal species were recorded, confirming the high naturalistic value of the Trieste area. Among the most widespread species were roe deer, wild boar and golden jackal. Of particular interest were the detections of the wildcat and European polecat, species of conservation relevance whose presence in an area so close to the city represents a finding of considerable scientific value.

In addition to compiling a checklist of the species present, the researchers used advanced statistical models to produce the first maps showing the probability of occurrence and abundance of the different species across the various environments of the municipal area, from forests and karst landscapes to agricultural and peri-urban zones. This information will make it possible to better understand the relationship between wildlife and habitat and to identify the areas where certain species are most concentrated.

“The results show that Trieste hosts a particularly rich and diverse mammal community,” explains Alessio Mortelliti. “This is not a phenomenon linked to climate change, but rather to the distinctive position of the Trieste area, which is closely connected from an ecological point of view with the Karst and the natural areas of Slovenia. This environmental continuity, together with the expansion of woodland across the Karst in recent decades, has favoured the presence of numerous wild species even close to the city.”

The data collected provide a valuable tool for updating knowledge of the fauna within the municipal territory and may support future activities related to biodiversity conservation, wildlife management, and urban and environmental planning by the Municipality of Trieste.