Venice's Lone Dolphin Is Fine - It's the Tourists Who Need Managing

Venice has always attracted celebrities. But few have generated as much scientific interest as Mimmo, a bottlenose dolphin that settled into the city's famous lagoon in June 2025 and has shown no apparent interest in leaving.

The dolphin is healthy. It feeds regularly on mullets, moves freely between the southern and northern ends of the lagoon, and displays behavior that researchers describe as entirely typical of the species. What is not typical is its location: directly in front of San Marco Square, one of the most intensively visited tourist areas on Earth.

A team led by Dr. Guido Pietroluongo, a conservation veterinary pathologist at the University of Padova, has spent months observing Mimmo from boats, supported by local authorities and citizen volunteers. Their findings, published in Frontiers in Ethology, conclude that the animal itself presents no particular management challenge. The people around it are another matter.

A species returning to historic territory

Bottlenose dolphins were once abundant throughout the Adriatic Sea, including in the Venetian Lagoon. Common dolphins, less adaptable than their bottlenose relatives, essentially vanished from the area before the 1970s under human pressure. Bottlenose dolphins proved more resilient overall, but they too have avoided lagoon waters for decades.

Mimmo's arrival, then, is not biologically anomalous. The species has inhabited these waters before, and the animal is physiologically suited to the environment. "Observing bottlenose dolphins in urban areas is not particularly surprising, as they are extremely adaptable and opportunistic marine mammals," said Pietroluongo. "Mimmo appears healthy and is regularly observed feeding on mullets. Since his arrival in the lagoon, any behavior displayed has been typical of the species."

The dolphin moved gradually from the southern lagoon toward Venice over several months, eventually settling near San Marco Basin - which is where the complications begin. That area is not just busy; it is one of the most congested waterways in Europe, filled with motorboats, water taxis, tourist vessels, and gondolas. Boat propellers represent a genuine threat to any marine mammal navigating those waters.

What the monitoring showed

Weekly observations from June 2025 onward tracked Mimmo's health, movements, and behavioral patterns. The animal showed no signs of distress, illness, or maladaptation. It was not behaving like a lost or disoriented animal - it was foraging, resting, and exploring in ways consistent with normal bottlenose dolphin activity.

Early attempts to discourage the dolphin from staying used acoustic deterrents. They failed. The researchers note that such efforts are not advisable in any case; bottlenose dolphins are intelligent animals that can habituate to acoustic signals, and the stress involved in repeated deterrence attempts may cause more harm than the lagoon environment itself.

Capturing the dolphin to relocate it was also assessed and rejected. The risks of capture - stress, injury, disease exposure - outweigh any benefit, particularly for an animal that is demonstrably healthy. Open-sea waters, the presumed destination for any relocation, carry their own serious threats, primarily from fishing gear interactions.

Managing people, not wildlife

Dr. Giovanni Bearzi, the study's first author and a researcher with four decades of experience studying Adriatic dolphins, identifies the core problem with characteristic directness: "This situation is primarily about managing human behavior rather than managing the dolphin."

The behaviors in question are well documented around wild animals in urban or tourist settings - attempts to touch the animal, offers of food, dangerously close boat approaches, and irresponsible vessel speeds. Under existing Italian and European law, any disturbance of a wild protected animal is already prohibited. The study argues that enforcement of these existing regulations, rather than creation of new interventions, is the most appropriate response.

Practical measures the researchers endorse include speed restrictions in the San Marco Basin, enforced exclusion zones around the dolphin, and clear public communication about what constitutes appropriate behavior near wild marine mammals. Feeding the dolphin is particularly problematic: animals that associate humans with food lose their natural caution and are more likely to sustain injuries from vessel contact.

"Recognizing the priority of safeguarding a protected species, treating it as a wild animal, and behaving in an informed, aware, and responsible way is key in wildlife management," Bearzi noted. Conservation responses, the team emphasizes, should be guided by scientific expertise rather than media narratives that treat the dolphin primarily as a public spectacle.

A longer view

The study's authors situate Mimmo within a broader historical context. Dolphins and human maritime activity have coexisted in the Mediterranean for millennia. Ancient art and historical accounts document dolphins accompanying boats; the relationship was once unremarkable. The current difficulty is not the dolphin's presence but the erosion of cultural knowledge about how to behave around wild animals.

"What is truly unusual is not the dolphin's presence, but the persistent difficulty humans have in respecting such animals today," Bearzi concluded. "We need to appreciate the opportunities to coexist with and enjoy wildlife."

The researchers are continuing to monitor Mimmo. As of their publication date, the dolphin remains in the lagoon, apparently in good health, apparently unbothered by its fame. The same cannot always be said of the crowds watching from the shore.