Darwin's fox

Darwin's fox or Darwin's zorro (Lycalopex fulvipes) is an endangered canid from the genus Lycalopex, which is distantly related to wolves and whose members are not true foxes. It is also known as the zorro chilote or zorro de Darwin in Spanish and is endemic to Chile, where it lives in the temperate rainforests of Nahuelbuta National Park, the Cordillera de Oncol, Cordillera Pelada, and Chiloé Island. It is a small, dark-colored species that is distinguished from other Lycalopex by its shorter legs, broader head, and darker pelage. Darwin's fox was first collected from San Pedro Island off the coast of Chile by the naturalist Charles Darwin in 1834, after whom the species is named. It was...

The loss of habitat is an important threat as Darwin's fox prefers to inhabit forested areas, although they have been sited on plantations as well. The highest rates of forest loss are recorded in the coastal range of the Araucanía Region, where the annual forest loss rate reached 4.8% between 1999-2008. This was the second highest forest loss rate reported for Chilean temperate forest. Consequently, habitat loss reduces the total area available for Darwin’s fox and may favour fox species that prefer open areas. However, the effects of land cover changes on local interaction webs are unknown. In 2025, researchers are using species distribution modelling to predict potential habitat and ecological corridors of Darwin's fox. The study aims to understand where Darwin’s fox is most likely to occur in southern Chile, including areas where populations may not yet have been detected. The study allows the researchers to produce a map of potential habitat suitability, and provide scientific evidence for conservation planning. Potentially, researchers can design ecological corridors to improve connectivity among isolated populations. Darwin’s fox has been recorded in the following public protected areas: Alerce Costero National Park (Los Ríos Administrative Region), Nahuelbuta National Park (Araucanía Administrative Region), and Chiloé National Park (Los Lagos Administrative Region). It has also been recorded in the following private protected areas: Caramávida Reserve (Biobío Administrative Region), Oncol Park and Valdivian Coastal Reserve (Los Ríos Administrative Region), and Tantauco, Ahuenco and Tepuhueico Parks (Los Lagos Administrative Region).

Chile

Darwin's fox is an opportunistic omnivore and has a varied diet. In general, most of its diet is believed to come from insects, however, it also feeds on small mammals, birds, reptiles, fruits and seeds. Scat analysis of Darwin's fox populations in Nahuelbuta National Park consisted mostly of mammals, including Akodon, Monito del monte, Southern big-eared mouse, and long-clawed mole mouse, although it also contained birds, reptiles, insects, arachnids, and plants. Scat analysis of populations on Chiloé Island consisted mostly of invertebrates, especially arthropods and Cratomelus armatus, rodents, and fruits, but also contained fish, reptiles, birds, and Monito del monte. Intake of specific dietary items varies seasonably in this population, with a greater intake of rodents and lesser intake of invertebrates in winter.

Darwin's Fox is a small, dark canine weighing 1.8 to 3.95 kg (4.0 to 8.7 lb), has a head-and-body length of 48 to 59 cm (19 to 23 in) and a tail that is 17.5 to 25.5 cm (7 to 10 in). There are no major external differences between male and female apart from the broader muzzle observed in males. The species is restricted to forest habitats and does not interbreed with the other Lycalopex species. It is smaller and darker-colored than other members of the genus and shows several distinguishing morphological traits. Compared to the South American gray fox, the Darwin's fox has shorter legs, a broader and shorter skull, smaller auditory bullae, more robust dentition, with differences in jaw shape and premolar occlusion. Its pelage is mottled, consisting of black and gray fur with reddish tones on the ears and lower legs. White markings are found under the chin, along the lower mandible, on the underbelly, and inner portions of the legs. The short, bushy, dark gray tail is a diagnostic characteristic used to distinguish from other related species.

Until the discovery of a small mainland population in Nahuelbuta National Park in 1990, it was thought that Darwin’s fox was endemic to Chiloé Island. It was theorized that during the late Pleistocene, Chiloé Island was connected to mainland Chile by a land bridge which was severed about 15,000 years ago, leading to the two isolated populations of Darwin’s fox. Mitochondrial DNA analysis of several South American foxes suggested Darwin's fox is a distinct species that originated in the Late Pleistocene, when an invasion of foxes occurred in South America. It was also found that the DNA of mainland and Chiloé island populations of Darwin's foxes only differ by 2%. Since there has been no record animals being released from Chiloé island to the mainland, it is believed that the existence of a mainland Darwin's fox population can be explained as a remnant of a more widely spread species from the Late Pleistocene fox invasion into South America.

In 2016, the IUCN classified Darwin's fox as Endangered. Current estimates of the total population are low and protecting the species remains challenging due to multiple threats.

Darwin's Fox is vulnerable to human-caused mortality. In Chiloé, reports from local communities indicate that Darwin's fox is killed due to its perceived threat to domestic animals. In addition, there have been documented cases of foxes being caught in traps and relocated after poultry predation. In Oncol Park, Alerce Costero National Park, and Valdivian Coastal Reserve, there have been reports of some species of foxes being killed as a response to predation on poultry, however, it is unknown if Darwin's fox is part of this population. Furthermore, construction of bridges, highways and roads between Chiloé island and the mainland is considered an indirect threat to foxes. In the absence of barriers, the bridge could facilitate the dispersal of non-native species to the island, such as closely related fox species and pumas (Puma concolor). The consequences require further investigation. The only known captive population is maintained by Fauna Adina near Villarrica, Chile, where the species has successfully reproduced. In September 2023, a Plan for the Recovery, Conservation and Management (Spanish acronym RECOGE) for Darwin's fox was submitted to the Chilean Ministry of Environment with its focus being addressing major knowledge gaps to better implement conservation efforts for the species. In 2025, the Darwin's fox was added to the RECOGE plan, allowing greater protections for the species and its habitats.