Category: Neotropical Biology and Conservation

We at Pensoft Publishers, asked Travis Bayer, the founder of Pathos Wildlife, several questions about his work with one of the world’s most mysterious carnivores, namely the Cozumel Dwarf Fox from Cozumel Island, Mexico.

The research he led was recently published in our open-access journal, Neotropical Biology and Conservation.

In this Q&A, Travis takes us behind the scenes of his study to discuss what first motivated him to track this cryptic species, what they currently know of its fragile conservation status, and the urgent measures needed to protect it from extinction.

Pensoft (P): What motivated your and your team to conduct research?

Travis Bayer (TB): Cozumel sits along the Great Mesoamerican Reef, the second largest reef system on Earth and one of the world’s most renowned scuba diving destinations. I first visited the island back in early 2023 to experience it for myself. At the core of my career as a biologist and conservationist is a lifelong love and fascination for animals, which is why I always look up the native wildlife and try to see them wherever I go.

That is when I had found out about Cozumel’s incredible level of endemism, higher than any other island in Mexico. Above its biodiverse waters lie terrestrial ecosystems hosting dozens of species and subspecies found nowhere else on Earth. Even more fascinating is three of them being dwarfed mammalian carnivores: the pygmy raccoon (Procyon pygmaeus), dwarf coati (Nasua nelsoni), and Cozumel fox (Urocyon sp.).

This is quite unusual given carnivores are generally less likely to become dwarfed or persist on small, resource-limited islands because of their space and energy requirements. Yet on Cozumel, this pattern occurs across multiple species.

I naively thought I might encounter the fox if I searched hard enough, but I ultimately returned home without seeing one. However, the question of whether they still persisted never really left my mind.

I turned my curiosity into an investigation, scouring scientific literature for every recorded mention of the Cozumel fox. The only physical evidence of its existence came from subfossil bones excavated from Mayan archaeological sites. These 500-to-1,500-year-old adult bones were 60-80% smaller than mainland foxes, suggesting they have been evolving in isolation for at least 5,000 to 13,000 years. This warrants a distinct species designation, yet without modern evidence, the Cozumel fox remains scientifically undescribed and legally unprotected.

The consensus of their critically endangered or possibly extinct status comes from generalized surveys documenting the other carnivores, which failed to detect the fox. While no field study has ever detected the fox, I found that none have ever targeted them specifically.

Previous camera trap studies used general baits like sardines and cat food, which heavily attract a broad range of species such as the omnivorous raccoons and coatis. Extremely rare animals also often require broader coverage, longer deployment times, and targeted placement in remote habitat, making study design crucially important. This is when I decided to turn my interest into action, and began planning the first-ever systematic, targeted survey in search of the Cozumel fox.

Shortly after, the ultimate driving force for our motivation surfaced: in September 2023, the first-ever photographs of a living Cozumel fox were uploaded to iNaturalist by Rafael Chacón, Director of Conservation and Environmental Education for La Fundación de Parques y Museos de Cozumel (FPMC). For a species many believed extinct, seeing those images was surreal. It proved the fox was still out there, and the urgency to protect it skyrocketed.

We established a partnership to launch a dedicated camera trap survey. When I asked Rafael what motivated him, he told me:

“Photographing the Cozumel gray fox was a very special moment because it represents one of the island’s unique endemic species. Capturing these images helps create awareness about its presence and the importance of protecting its habitat. What motivates me to continue is the responsibility to help future generations understand and value Cozumel’s biodiversity.”

Formally publishing these photographs in Neotropical Biology and Conservation changed this from an anecdotal sighting into a permanent scientific record. Species cannot be protected if their existence remains contested or overlooked. We hope this work lays the foundation for future research, conservation planning, and official taxonomic recognition.

P: You describe the species’ conservation status as “likely critical.” What are the biggest threats to the Cozumel fox today?

TB: The biggest challenge is that we still know almost nothing about its population size, distribution, or ecology. That uncertainty makes effective conservation incredibly difficult, and the lack of a formal taxonomic description limits our ability to implement legal protections.

However, based on what we know about island ecosystems, several major threats stand out:

• Habitat Loss & Fragmentation: Rapid development driven by tourism, cruise ship infrastructure, and expanding hotels places immense pressure on remaining natural habitats.

• The Coastal Highway: Cozumel has one major highway looping the island that cuts directly through critical transition zones between coastal and interior habitats. Wildlife-vehicle collisions occur at alarming rates. This poses a massive threat to carnivores who need to move freely to maintain genetic connectivity, find resources, and adapt to seasonal water availability.

• Introduced & Invasive Species: Free-ranging domestic dogs compete for resources and introduce deadly disease risks to a small, isolated population. Concurrently, invasive predators like boa constrictors, margays, and ocelots create intense pressure through competition and direct predation. The growing abundance of introduced margays and ocelots is a relatively recent, alarming concern.

• Climate Change & Rarity: As a low-lying Caribbean island, Cozumel is highly vulnerable to intensifying hurricanes and storm surges. Because the fox population is already so small, they are inherently vulnerable to genetic bottlenecks and random catastrophic events.

P: What conservation measures could be undertaken to help protect the species?

TB: The most urgent priority is establishing a long-term research and monitoring program focused specifically on the fox. Before we can implement meaningful protections, we must understand exactly where they survive, how many are left, and what habitats they depend on.

To achieve these goals, we must prioritize mitigating road mortality by installing dynamic speed feedback signs to slow highway traffic and improve habitat connectivity. Additionally, we need to manage invasive and domestic animals through responsible pet ownership, sterilization programs, and the removal or relocation of invasive predators like margays to minimize disease and predation risks. Finally, because conservation is a collective responsibility, we must foster robust community involvement and public awareness to educate residents and visitors about the Cozumel fox, thereby securing the local support and cooperation vital for these measures to succeed.

P: Are there any other comments or insights from this research that you think might be of particular importance to the broader public?

TB: One of the most important takeaways from this research is that species can quietly disappear without the world even realizing they are gone. It had been over 20 years since the last anecdotal report of the fox, and almost 30 years since the last confirmed sighting. The Cozumel fox likely represents an ancient island lineage that has evolved in isolation for thousands of years, yet until recently there was no photographic evidence that it was even still alive.

We often think extinction is something dramatic and obvious, but in reality it can happen gradually and silently, especially for rare species living in remote or understudied habitats. By the time enough data exists to confirm a severe decline, it may already be too late. That is part of what makes documentation like Rafael’s photos so important. It should serve as a reminder of how much biodiversity can still remain overlooked, even in places visited by millions of people every year.

The rediscovery of the fox isn’t a conservation success story yet, but it is a second chance.

In collaboration with Pathos Wildlife and the FPMC, we are currently conducting one of the largest camera trap surveys ever done on the island. Ultimately, we hope this work moves the Cozumel fox from a little-known, uncertain presence to a protected, well-understood key part of Cozumel’s ecosystems. This project demonstrates that conservation is often most urgent when certainty is lowest, and that uncertainty itself should be our call to action.

We are incredibly grateful to Travis Bayer for giving us a closer look at his and his team’s vital conservation work on the island. To read the formal scientific record and documentation of these historic sightings, check out the recently published paper in Neotropical Biology and Conservation.

Citation:

Bayer TD, McGreal MA, Chacón D. AR (2026) First photographic evidence of an insular dwarf fox (Urocyon sp.) on the island of Cozumel, Mexico. Neotropical Biology and Conservation 21(2): 123-129. https://doi.org/10.3897/neotropical.21.e187967