The jaguarundi is one of the more unusual-looking wild cats in the Americas, with a long, low-slung body, small rounded ears, and a coat that comes in two strikingly different color forms. Ranging from northern Mexico to central Argentina, this small felid is classified as Least Concern by the IUCN, yet it remains one of the least studied cats in the Western Hemisphere. Its secretive habits and preference for dense undergrowth have made it genuinely difficult to observe, and much of what researchers know comes from camera-trap by-catch, scat analysis, and a patchwork of regional studies rather than any comprehensive field program.
A Cat That Looks Like a Weasel
Jaguarundis weigh roughly three to nine kilograms, placing them among the smaller New World felids. Their proportions set them apart from nearly every other cat species: the body is elongated and somewhat flattened, the legs are short, the tail is long, and the head is small and narrow with a distinctly otter-like or weasel-like profile. In parts of Latin America, they have earned folk names that translate to “weasel cat” or “otter cat” for exactly this reason. Unlike most cats, whose skull proportions vary mainly by size, the jaguarundi’s facial structure is unusually streamlined, reflecting a body plan adapted for moving through dense, low vegetation.
The most visually striking feature is coat color. Jaguarundis come in two broad morphs: a grey-to-dark blackish form and a reddish-to-chestnut form. These are not separate subspecies. Both morphs can appear in the same litter. Across the species’ full range, roughly 80% of documented individuals are grey or dark, while about 20% are reddish. But that overall ratio masks dramatic geographic variation. Grey and dark animals turn up across the entire range and are strongly associated with moist, dense forests. The reddish form is far more spatially restricted, concentrated in dry and open landscapes like deserts and xeric scrublands. Environmental modeling has shown that moisture-related variables are especially powerful in predicting which morph dominates a given area, pointing to natural selection acting on coat color over evolutionary time rather than random genetic drift.1Journal of Zoology. Biogeography of polymorphic phenotypes: Mapping and ecological modelling of coat colour variants in an elusive Neotropical cat, the jaguarundi (Puma yagouaroundi)
At the genetic level, the melanistic mutation responsible for the grey phenotype involves the melanocortin-1 receptor gene (MC1R), the same gene implicated in melanism across many mammal species. In one population study from Mexico, the frequency of the melanistic allele was about 0.33, with the ancestral (reddish) allele at 0.67, illustrating how allele frequencies can differ markedly from the visible proportion of dark animals depending on the inheritance pattern and the local environment.2Wildlife Society Bulletin. Population genetics of jaguarundis in Mexico: Implications for future research and conservation
Where Jaguarundis Live
The jaguarundi’s historical range stretches from southern Texas and both coasts of Mexico south through Central America and into South America as far as central Argentina. Throughout that enormous span, the species occupies habitats with dense undergrowth, but it is not strictly a deep-forest animal. A synthesis of existing studies found jaguarundis may be most abundant in seasonally dry forests, Atlantic Forest remnants, gallery forests along waterways, and mixed grassland-agricultural landscapes rather than in pristine interior rainforest.3Mammal Review. Ecology and status of the jaguarundi Puma yagouaroundi: a synthesis of existing knowledge This flexibility helps explain why the species persists across a broad geographic area even as habitat quality declines.
One striking exception is the United States. A long-running camera-trap study across southern Texas and northern Tamaulipas, Mexico, accumulated over 350,000 trap nights at 685 camera sites between 2003 and 2021. Across all that effort in Texas, not a single jaguarundi was photographed. Combined with the absence of any confirmed sighting (photograph, specimen, or equivalent) in the U.S. since 1986, the researchers concluded that the jaguarundi is likely extirpated from the United States and recommended that federal and state agencies formally acknowledge this and initiate recovery actions under the existing federal recovery plan.4PubMed Central. Status and distribution of jaguarundi in Texas and Northeastern México: Making the case for extirpation and initiation of recovery in the United States The jaguarundi was never common in Texas, but the complete absence over nearly four decades of looking makes a strong case that it no longer occurs north of the border.
An Unusually Diurnal Cat
Most wild cats are crepuscular or nocturnal. The jaguarundi is an outlier. In a captive study comparing the daily activity rhythms of nine South American felid species, jaguarundis were the most diurnal of the group, with about 87% of their activity counts occurring during daylight hours. That placed them at the opposite extreme from the margay, which was the most nocturnal at 72% nighttime activity. The other species fell along a gradient between these two poles.5PubMed. Daily rhythmicity of behavior of nine species of South American feral felids in captivity Field data from wild populations back this up: a camera-trap study of mammalian predators and prey in Costa Rica confirmed that the jaguarundi, along with the tayra (a large mustelid), was mostly diurnal in its activity patterns.6PubMed Central. Circadian activity patterns of mammalian predators and prey in Costa Rica
This daytime schedule has real ecological consequences. In Neotropical forests where several cat species coexist, temporal partitioning helps reduce direct competition and the risk of larger cats killing smaller ones. The jaguarundi’s diurnal habits create strong temporal separation from the similarly sized but largely nocturnal margay and from the ocelot, a larger cat that could pose a threat. Research in Neotropical felid assemblages has found high temporal partitioning between jaguarundis and both ocelots and margays, even where all three share the same forest patches.7PubMed Central. Prey availability and temporal partitioning modulate felid coexistence in Neotropical forests One analysis of niche partitioning concluded that the jaguarundi’s strict diurnality may reduce the effects of both interference competition and outright attacks from larger, mostly nocturnal ocelots, while also limiting competition with margays.8Acta Oecologica. Niche partitioning and species coexistence in a Neotropical felid assemblage
Home Range and Density
Despite their small body size, jaguarundis roam over surprisingly large areas. A telemetry study in the Southern Atlantic Forest of Brazil found average home ranges of about 51 square kilometers using kernel-based estimates, or about 21 square kilometers using minimum convex polygon methods. In that same study, jaguarundis covered more ground than both the southern tiger cat and the margay, with wider movement parameters suggesting more intense daily travel. Density was correspondingly low: based on three tracked individuals occupying a combined area of roughly 81 square kilometers, the minimal density came out to about 0.04 individuals per square kilometer.9Brazilian Journal of Biology. Home range and density of three sympatric felids in the Southern Atlantic Forest, Brazil
Low density and large home ranges partly explain why jaguarundis are so hard to study. They are spread thin across the landscape, move a lot during daylight, and stick to dense cover. Even dedicated camera-trap surveys aimed at other cats (ocelots especially) tend to pick up jaguarundis only as occasional by-catch rather than primary detections.
What Jaguarundis Eat
The jaguarundi is primarily a hunter of small vertebrates. An analysis of scat and regurgitate samples from a mosaic of Atlantic Rainforest and eucalyptus plantations in southeastern Brazil identified 19 prey items across 74 prey occurrences. Small mammals dominated the diet at about 42% frequency, followed by birds at 21% and reptiles at 14%. Even in tall tropical forests and eucalyptus plantations, the jaguarundi preyed mainly on animals that live on or come down to the ground rather than arboreal species, consistent with its own terrestrial habits. The study also documented the first recorded predation of viper snakes by jaguarundis.10PubMed. Jaguarundi (Puma yagouaroundi) (Geoffroy, 1803) (Carnivora, Felidae) food habits in a mosaic of Atlantic Rainforest and eucalypt plantations of southeastern Brazil
How specialized the diet is depends heavily on what prey is available. In the Brazilian Pampa, a temperate grassland with lower small-mammal diversity than the Atlantic Forest, a dietary analysis found the jaguarundi was actually the most specialized feeder among the sympatric small cats studied, consuming mainly Brazilian guinea pigs alongside just a couple of other mammalian taxa. The researchers noted that this was unexpected given the broad prey list described in forest-based studies and attributed the narrow diet to the limited small-mammal community of the Pampa rather than to any inherent preference.11PLOS ONE. Trophic ecology of sympatric small cats in the Brazilian Pampa The takeaway is that jaguarundis are opportunistic generalists that can narrow their diet substantially when living in ecosystems with fewer prey options.
Conservation Status and Habitat Threats
The IUCN lists the jaguarundi as Least Concern, though with the caveat that it should be regularly reviewed. The species is included in CITES Appendix II across its range, with Central and North American populations elevated to Appendix I, reflecting greater concern in those regions. Hunting is prohibited in most range countries, including Argentina, Brazil, Mexico, Colombia, and the United States, among others.12The IUCN Red List of Threatened Species. Herpailurus yagouaroundi
That Least Concern label can be misleading. The jaguarundi benefits from a large geographic range, but local and regional populations face serious pressure from habitat conversion. In the Atlantic Forest of Brazil, one of the world’s most threatened biomes, modeling showed that converting native forest to treeless land uses was the single most important variable driving habitat loss for four sympatric felid species, including the jaguarundi. All four cats were negatively affected by forest loss, with the continued conversion of unprotected forest areas projected to cause further habitat shrinkage.13Biotropica. Cats under cover: Habitat models indicate a high dependency on woodlands by Atlantic Forest felids The jaguarundi’s reliance on dense understory vegetation means it is not just losing total forest area but also losing the specific structural features within forests that it depends on for cover and hunting.
A global population estimate based on distribution modeling placed the total jaguarundi population at roughly 35,000 to 230,000 individuals, occupying around 4.5 million square kilometers of Meso- and South America at the 0.5 probability level of occupancy. The model found that occupancy was positively associated with rugged terrain and herbaceous cover.14Wiley Online Library. Estimating species distribution from camera trap by‐catch data, using jaguarundi (Herpailurus yagouaroundi) as an example That wide confidence interval reflects how little direct data exists. The species could number in the low tens of thousands or the low hundreds of thousands, and no one is in a position to confidently narrow the window. For a cat that spans much of the Neotropics, the research effort has been remarkably thin.
Evolutionary Roots
The jaguarundi’s closest living relative is the puma. Despite looking nothing alike — the puma is one of the largest New World cats, the jaguarundi one of the smallest — they share a common ancestor that split from other felid lineages during the late Pliocene. A mitogenomic analysis found that the initial mitochondrial diversification within the jaguarundi also dates to the late Pliocene, though the bulk of haplotype expansion occurred during the Pleistocene, when cycling glacial and interglacial periods repeatedly rearranged habitats across the Americas.15Mammalian Biology. Mitogenomics of the jaguarundi (Puma yagouaroundi, Felidae, Carnivora): Disagreement between morphological subspecies and molecular data The same study found significant disagreement between traditionally recognized morphological subspecies and actual genetic clustering, a common finding across felids and one that complicates conservation planning when management units are drawn around subspecies boundaries that may not reflect real evolutionary history.
Disease Spillover from Domestic Animals
As habitat fragmentation pushes jaguarundis into closer contact with human settlements and domestic animals, disease transmission has become a growing concern. In Brazil’s Cerrado region, serological testing of 169 wild carnivores found that over half were exposed to parvovirus, and jaguarundis were among the species with antibodies to the virus — the first documentation that free-ranging jaguarundis carry evidence of parvovirus exposure.16PubMed. Exposure of Free-Ranging Wild Carnivores and Domestic Dogs to Canine Distemper Virus and Parvovirus in the Cerrado of Central Brazil
More alarming findings came from a study that detected actual viral genetic material in dead wild carnivores. Canine parvovirus DNA was found in the spleen of a jaguarundi, and canine distemper virus RNA was detected in the liver of another jaguarundi. Phylogenetic analysis of the parvovirus sequences showed 100% identity with strains circulating in domestic dogs, confirming a direct domestic-to-wild transmission pathway.17PubMed Central. Occurrence of Typical Domestic Animal Viruses in Wild Carnivorans: An Emerging Threat to the Conservation of Endangered Species These viruses can be fatal in felids with no prior immunity, and for a species that already occurs at low densities, localized disease outbreaks could have outsized effects on small populations.
Parasites present a parallel problem. At a facility housing captive Neotropical felids, researchers found that jaguarundis shared the gastrointestinal nematodes Toxocara cati and Trichuris campanula with feral cats roaming the premises. During the study period, a pair of jaguarundis died with clinical signs of whipworm infection — the first report of T. campanula in jaguarundis. Because feral cats move freely through fragmented habitats, the same kind of parasite cross-transmission could occur in wild populations wherever jaguarundis and domestic or feral cats overlap.18Journal of Zoo and Wildlife Medicine. Cross Transmission of Gastrointestinal Nematodes Between Captive Neotropical Felids and Feral Cats
Why This Cat Remains Understudied
Most Neotropical cat research has historically focused on jaguars, pumas, and ocelots, species that are either flagship conservation targets or large enough to attract public attention. The jaguarundi falls through the cracks. It is not endangered enough globally to trigger emergency funding, not large enough to serve as a charismatic ambassador, and not rare enough in aggregate to appear on most conservation priority lists. Yet it is genuinely difficult to study in the field. Its low density, large home ranges, diurnal schedule (which means it is active when many researchers are checking camera traps rather than deploying them), and preference for impenetrable thickets all conspire to keep detection rates low.
Even the global population estimate mentioned earlier had to be built from camera-trap by-catch data, essentially piggy-backing on surveys designed for other species. The researchers who produced that estimate acknowledged that fundamental information on abundance and distribution is still lacking. For a cat that spans most of Latin America, there are remarkably few dedicated field studies, and genetic data remains patchy. The single-population genetics study from Mexico found only one mitochondrial haplotype among its samples, suggesting extremely low mitochondrial diversity in at least that population — a potential red flag for long-term resilience even if overall numbers are adequate for now.2Wildlife Society Bulletin. Population genetics of jaguarundis in Mexico: Implications for future research and conservation
The jaguarundi occupies an awkward middle ground in conservation biology. It does not inspire the urgency of a critically endangered species, but it is quietly losing ground across the northern edge of its range and facing novel disease threats as habitat fragmentation brings it into contact with domestic animals. Its Least Concern listing reflects a wide range map, not a deep understanding of population health. Whether the species can maintain that status as forests shrink and fragment across the Neotropics is a question no one has enough data to answer with confidence.