Arizona Jaguars: El Jefe, Sombra, and the US Border Story
Since 2011, four named jaguars have been camera-trapped in the US Southwest. All male, all dispersing from northern Sonora, all evidence that the species has not entirely given up on its historical US range. The story is one of slow, individual movements against substantial structural obstacles.
El Jefe, Sombra, Yo'oko, and the 2023 Huachuca cat. Four male jaguars across more than a decade in a country that historically held a breeding population.
The Historical US Jaguar Range
Jaguars were resident in the southwestern United States until the early 20th century. Documented historical range extended through southern and central Arizona, southern New Mexico, the Trans-Pecos region of west Texas, and possibly western Louisiana. Some older specimen records and travelers' accounts suggest historical presence as far north as the Grand Canyon and as far west as southern California; these northern records are contested by some current researchers but are at least plausible given the broad ecological niche the species occupies in similar Mexican habitat.
By the 1960s the US jaguar population was effectively gone. The last documented breeding female (a female killed in 1963 in southern Arizona's White Mountains region) is the latest confirmed reproductive female in the US record. Causes of extirpation are well-documented: predator control programs (US Biological Survey bounty programs and ranching-community shooting through the late 19th and early 20th centuries), habitat modification (overgrazing, water diversion, fence-building), and direct hunting for hides and trophies. The last US breeding population thus disappeared roughly a century after the last grizzly bears, wolves, and bison.
The northernmost surviving breeding population today is in northern Sonora, Mexico, in the Sierra Madre Occidental and the Sky Island habitats north of Hermosillo. The population is small (perhaps 100 to 200 individuals across the broader northern Mexican range) and itself relatively isolated from the larger jaguar populations in central and southern Mexico.
El Jefe (2011 to 2015)
El Jefe was the first widely-publicised US jaguar of the modern recolonisation era. The cat was first documented via camera trap in 2011 in the Santa Rita Mountains south of Tucson, Arizona. Over the following four years, the individual was repeatedly photographed across the Santa Rita and Whetstone ranges, with hundreds of camera-trap images establishing his persistent residency in the region. The name El Jefe (Spanish for The Boss) was bestowed by a contest organised by the Center for Biological Diversity in 2015.
El Jefe was a fully adult male (estimated age 5 to 8 years during his documented residency) and represented the first long-term confirmed US jaguar in several decades. His presence was strategically important because the Santa Rita range was at the time the subject of a proposed copper mining project (the Rosemont Mine); his documented presence in critical jaguar habitat became central to the legal challenge against the mine permit, with USFWS ultimately determining that the mine would significantly impact jaguar critical habitat.
El Jefe disappeared from US camera-trap records after September 2015 and was presumed to have moved back into Mexico. That was confirmed in striking fashion: in late November 2021 a camera trap in central Sonora, roughly 190 kilometres (120 miles) south of his last Arizona detection, photographed a jaguar whose rosette pattern matched El Jefe. The Borderlands Linkages Initiative announced the rediscovery in August 2022. He was alive, had crossed back into Mexico, and demonstrated that individual jaguars can survive undetected for years on either side of the border.
Sombra (2016 onward)
Sombra (Spanish for Shadow), catalogued by researchers as jaguar number 3, was the second well-documented modern US jaguar, first camera-trapped in late 2016 in the Chiricahua Mountains of southeastern Arizona. Unlike El Jefe, who was an adult on first detection, Sombra was a young adult on first detection and has been photographed dozens of times in the Chiricahuas in the years since, making him the most persistently documented of the modern US jaguars.
The Center for Biological Diversity and the Borderlands Linkages Initiative coordinated extensive camera-trap research on Sombra, producing hundreds of identification-quality images that confirmed individual recognition and tracked his movement patterns. His range was estimated at 600 to 800 square kilometres of Sky Island habitat, comparable to typical male jaguar territories in northern Mexico.
Sombra has continued to be photographed in the Chiricahua Mountains, and as of 2023 wildlife officials still believed him to be roaming southern Arizona; a pair of blurry 2023 detections in the Huachuca Mountains were too low-resolution for spot analysis and could not be ruled out as Sombra. His long residency has unfolded alongside the construction of new border wall sections in southeastern Arizona, which substantially constrained the north-south jaguar corridor that dispersing cats depend on.
Yo'oko and the 2023 Huachuca Jaguar
Yo'oko (a Yaqui language word for jaguar, the name chosen by students at Hiaki High School in Tucson) was documented in the Huachuca Mountains in 2016 and 2017. Unlike the other three individuals, Yo'oko's fate is known: he was illegally killed in northern Sonora, Mexico in 2018, with the carcass recovered. The case became a significant binational conservation enforcement matter. Yo'oko's death underscored the vulnerability of dispersing male jaguars to both retaliatory killing and trophy hunting in cross-border movement.
The most recent modern US jaguar was first camera-trapped in 2023 in the Huachuca and Whetstone Mountains southeast of Tucson, a young male born in northern Mexico that crossed the border as a disperser. US Fish and Wildlife Service and other trail cameras recorded him more than a dozen times. In May 2024, after almost 1,000 Tohono O'odham students, elders, and tribal members voted among ten candidate names, he was named O:had Nu:kudam (jaguar protector in the O'odham language, shortened to OH-shahd). He is counted as the eighth individual jaguar documented in Arizona and New Mexico since 1996.
Each of these four individuals represents one stochastic male dispersal from northern Sonora across the border. None has been observed mating in the US (the absence of female jaguars makes this impossible), and consequently none has contributed to a US breeding population. The pattern over thirteen years of approximately one new male every 3 to 4 years suggests that natural recolonisation by females, while not impossible, would be exceptionally slow without supplementation.
The Border Wall Question
The US-Mexico border infrastructure built or expanded between 2017 and 2021 substantially affects jaguar movement across the border. The completed wall sections are approximately 9 metres in height with no wildlife passages sized for large carnivores; small openings exist for smaller mammals but are inadequate for adult jaguars. The wall has been completed across portions of the historical jaguar movement corridor in southeastern Arizona and southwestern New Mexico, with significant fragmentation effects on the connectivity that supported the recent male dispersal events.
Camera-trap evidence from the Borderlands Linkages Initiative documents reduced cross-border jaguar movement since the relevant wall sections were completed. The frequency of new jaguar individuals in the US declined from one approximately every two years in the 2011 to 2018 period to one in five years in the 2018 to 2024 period. The decline is consistent with substantial wall-induced constraint on the movement that drives the natural recolonisation process.
Wildlife corridor advocates have proposed retrofit modifications to existing wall sections (large mammal passages with anti-human-passage design features) that would partially restore connectivity for jaguar movement. As of June 2026 no such modifications have been completed at scale in jaguar habitat. The Department of Homeland Security has not prioritised wildlife passage modifications in border infrastructure planning. The Biological Diversity Center and the Center for Biological Diversity have pursued litigation seeking wildlife passage requirements; these cases are ongoing.
The Recovery Plan
The US Fish and Wildlife Service published the formal Jaguar Recovery Plan in 2018, identifying suitable US habitat capable of supporting a viable breeding population. The plan estimates approximately 25,000 square kilometres of suitable habitat in the Sky Island region of southern Arizona and southwestern New Mexico, which is in principle adequate to support a self-sustaining breeding population of perhaps 100 to 150 adult jaguars given enough source individuals.
The plan identifies natural recolonisation as the preferred recovery mechanism, contingent on cross-border connectivity remaining viable. The plan does not currently recommend active reintroduction (capture and release of Mexican jaguars into the US habitat) as the primary tool, though the recovery framework would accommodate such an approach if natural recolonisation proves inadequate. Active reintroduction would require substantial planning, community engagement, federal funding, and binational coordination with Mexico.
The plan also identifies the threats and challenges: border infrastructure as the primary connectivity constraint; ranching and livestock interests in southern Arizona; ongoing habitat fragmentation from infrastructure (roads, energy development); illegal hunting and trade. The framework for recovery exists; the political will, the funding, and the binational cooperation required to act on it are works in progress as of June 2026.
Frequently Asked Questions
Are there really jaguars in the United States?
Yes, occasional individuals, but no breeding population. Since 2011, four named individual jaguars have been documented in the US Southwest (Arizona and New Mexico) via remote camera trap: El Jefe (Santa Rita Mountains, 2011 to 2015, then rephotographed alive in central Sonora, Mexico in late 2021), Sombra (Chiricahua Mountains, 2016 onward), Yo'oko (Huachuca Mountains, 2016 to 2017, killed in Mexico in 2018), and the cat first documented in 2023 in the Huachuca and Whetstone Mountains and named O:had Nu:kudam (jaguar protector in the Tohono O'odham language) in 2024, counted as the eighth jaguar recorded in the US since 1996. All have been dispersing males from the northernmost reproductive jaguar population in northern Sonora, Mexico. No female jaguar has been documented in the US since the 1960s, and consequently no breeding has occurred.
Why aren't there more jaguars in the United States?
The historical US population was eliminated by the early 20th century through hunting, predator control (livestock protection), and habitat modification. The historical range extended through southern Arizona, New Mexico, Texas, and likely western Louisiana, with possible historical presence in California. The species has not been able to recolonise on its own because the source population in northern Sonora is small and fragmented, female jaguars rarely disperse the distances males do, and the border infrastructure (particularly the post-2017 border wall sections) substantially constrains north-south movement of large carnivores.
Could jaguars be reintroduced to the US Southwest?
Technically yes, ecologically yes, politically uncertain. The US Fish and Wildlife Service has produced a Jaguar Recovery Plan (2018) that identifies suitable habitat in the Sky Island region of southern Arizona and New Mexico capable of supporting a viable breeding population. Habitat exists and prey is available. The political constraints are substantial: jaguar reintroduction would require ranching community consent in the affected counties, federal funding, coordination with Mexico (the source country), and considerable local public engagement. As of {LAST_VERIFIED_LABEL} no active reintroduction program has been initiated, but the regulatory framework exists.
What does the border wall mean for jaguar recovery?
The border wall sections completed in 2017 to 2021 substantially constrain jaguar movement across the border. The wall is approximately 9 metres high in most completed sections, with no wildlife passage features in jaguar habitat (the small openings that exist are sized for smaller mammals). Camera-trap evidence has documented declining jaguar movement across the border since the wall sections were completed. The single most important constraint on natural recolonisation is therefore the wall itself; removing or modifying it for wildlife passage would substantially improve recolonisation prospects.
Where can I learn more about the named US jaguars?
The US Fish and Wildlife Service Jaguar Recovery Plan (2018) and annual update reports document the named individuals. The Center for Biological Diversity has maintained extensive public reporting on individual sightings including time-stamped camera-trap photographs. The Borderlands Linkages Initiative coordinates camera-trap research in southern Arizona. The Sky Island Alliance documents species movement across the broader Sky Island region. National Geographic and the Washington Post have covered individual jaguars (particularly El Jefe) in feature reporting.
Related pages
By the Digital Signet editorial team. Sources: USFWS Jaguar Recovery Plan (2018), Center for Biological Diversity Jaguar Project, Borderlands Linkages Initiative, Sky Island Alliance, IUCN Red List, Panthera onca (2017 assessment). Full citations at /sources. Reviewed June 2026.