Nahuelito
Aliases: Nahuel Huapi Lake monster / Territory: Argentine
A 'plesiosaur' reported in Lake Nahuel Huapi since 1910, hunted by a zoo expedition in 1922, never verifiably photographed.
Lake Nahuel Huapi — 'island of the jaguar' in Mapudungun, the language of the Mapuche people — is a deep glacial lake in the Patagonian Andes, with the resort city of Bariloche on its shore. Mapuche tradition in the region includes water beings such as the Cuero, a living 'hide' said to seize swimmers; that older layer belongs to a living cosmology of its own and should not be confused with the modern monster, nicknamed Nahuelito on the affectionate model of Nessie.
The modern file opens with George Garrett, manager of a lake navigation company, who claimed to have seen a long-necked creature surface near a bay around 1910; his account was only published in 1922, just as the story broke nationally. That year Clemente Onelli, director of the Buenos Aires Zoo, received reports — including one from the Texan gold prospector Martin Sheffield — describing an animal that sounded like a plesiosaur. The zoo bankrolled an armed expedition to the lake, followed by the international press and criticized within Argentina by early wildlife advocates. It came home with nothing: no animal, no trace.
Sightings have recurred in waves ever since: humped silhouettes, unexplained wakes, and stories that occasionally entangle the lake with the Huemul Project, Argentina's failed 1950s fusion-research venture on one of its islands. In 2006, anonymous photographs dropped off at a Bariloche newspaper briefly revived the case; with no author, no negatives and no context, they are unverifiable and widely regarded as a fabrication.
The lake — cold, nutrient-poor and glacially young — is a meagre larder for a breeding population of large unknown animals, and a Mesozoic marine reptile would have neither lineage nor climate there. Boat wakes, crossing waves, drifting logs, and real animals such as wandering sea lions or large introduced salmonids account comfortably for the record. Nahuelito nonetheless endures as Bariloche's most durable tourist emblem — a plesiosaur of the souvenir shop rather than the lakebed.
+ Notable reports
// Lake Nahuel Huapi, near Bariloche
George Garrett, an employee of a lake navigation company, says he glimpsed a raised neck above the water at dusk. Published only in 1922, his testimony becomes the founding account.
// Buenos Aires and Nahuel Huapi
Acting on reports including prospector Martin Sheffield's, Buenos Aires Zoo director Clemente Onelli sends an armed expedition after a 'plesiosaur'. It finds nothing, and the world press moves on.
// Bariloche
Anonymous photographs showing a dark shape at the surface are left at a local newspaper. With no identifiable author and no usable original, they are generally dismissed as a probable hoax.
+ Leading rational explanations
- Boat wakes and crossing waves on a vast, wind-swept lake, read as moving humps
- Drifting logs and debris from the forested shores
- Real animals misidentified: sea lions ascending from the river system, large introduced salmonids
- Media and tourism amplification: the monster is an economic emblem of Bariloche
- A relict plesiosaur is ruled out: no fossil or ecological evidence supports survival
Status note
Class 2: a century of testimony without one piece of workable physical evidence — the few photographs are anonymous and originals-free, so they do not amount to a verifiable trace, and the 1922 expedition returned empty-handed.
+ Frequently asked questions
- Is Nahuelito real?
- Nothing indicates it: no verifiable photograph, no remains, no convincing sonar return in a century of looking. The sightings are well explained by waves, logs and known animals. The case rests entirely on eyewitness testimony.
- What did the 1922 expedition find?
- Nothing at all. Organized by the Buenos Aires Zoo after reports of a plesiosaur-like animal, it searched Lake Nahuel Huapi without recording any creature or trace, and the story deflated as quickly as the international press had inflated it.
- Does the name Nahuelito come from Mapuche legend?
- No — it is a modern diminutive of the lake's name, Nahuel Huapi, 'island of the jaguar' in Mapudungun. Mapuche tradition does include water beings such as the Cuero, but they belong to a distinct, living cultural corpus, not to the twentieth-century media monster.