About
Patagotitan mayorum holds a staggering distinction: it is the largest land animal we currently know of. First discovered in 2012 when a farm worker in Patagonia, Argentina stumbled upon a massive fossil protruding from the ground, the animal took years to excavate and describe.
The numbers are almost hard to process. At roughly 37 meters long and 69,000 kilograms — about the weight of 10 African elephants — Patagotitan pushed the upper limits of what biology allows for a land animal. At some point, legs simply cannot support more mass; Patagotitan was likely near that limit.
Like all sauropods, Patagotitan had a long neck for reaching vegetation high in the tree canopy, a barrel-shaped body, and a long tail that served as a counterbalance. Its bones, while massive, were partially hollow — an that reduced weight without sacrificing structural strength.
A cast of the skeleton is so large that it doesn't fit inside the American Museum of Natural History — its neck and head poke out into the elevator lobby. The original fossils are housed at the Museo Paleontológico Egidio Feruglio in Trelew, Argentina.
Explore the anatomy
5 featuresThe neck and back vertebrae were riddled with deep hollows called pleurocoels — pockets where air sacs from the lungs invaded the bone. This built-in bubble wrap may have shaved 20–30% off the skeleton's weight, absolutely essential when you're pushing the limits of how big a land animal can get.
Stretching around 12 meters with at least 13 vertebrae, this incredible neck let Patagotitan sweep through a huge feeding zone without shuffling its massive body. Scientists think it held its neck mostly horizontal — like a giant vacuum cleaner — rather than raised up giraffe-style, saving precious energy.
Those super-wide, outward-curving ribs created a barrel-shaped torso that housed a massive fermenting gut — basically a giant compost tank for breaking down tons of tough Cretaceous plants. Even among giant titanosaurs, Patagotitan had an exceptionally chunky silhouette.
The thigh bone alone measured about 2.4 meters — taller than most adult humans — and stood almost perfectly upright like a building column to support the crushing weight above. Stress tests on these bones suggest they were working at nearly their breaking point, meaning Patagotitan may represent the absolute size limit for animals walking on land.
With over 40 vertebrae tapering to a whip-like end, this tail acted as a living counterweight to the enormous neck, keeping the centre of gravity balanced over the back legs. Wide bony projections near the tail's base anchored powerful muscles, meaning this wasn't just a floppy dragging rope — it was actively controlled.
Where fossils were found
Candeleros Formation
Neuquén · Argentina
113.2–100.5 million years ago(12.7m year span)
Where Patagotitan mayorum Roamed
During the Early Cretaceous, Patagotitan mayorum roamed the forests and floodplains of southern Gondwana, in a region that would become modern-day Patagonia, Argentina. This landscape featured seasonal rivers, diverse conifers, and a warm, semi-arid climate that supported an extraordinary assemblage of titanosaurian giants.
Keep exploring the vault
Giganotosaurus
Giganotosaurus carolinii
Giganotosaurus carolinii was the apex predator of the Candeleros Formation where Patagotitan lived.
Dreadnoughtus
Dreadnoughtus schrani
As fellow titanosaurids, Patagotitan and Dreadnoughtus represent parallel experiments in extreme gigantism within the same family.
Argentinosaurus
Argentinosaurus huinculensis
Both Patagotitan and Argentinosaurus represent independent titanosaur lineages that achieved extreme gigantism in Cretaceous South America.
Brachiosaurus
Brachiosaurus altithorax
Both represent the evolutionary drive toward extreme gigantism in sauropods, though from different lineages and time periods.
Sauroposeidon
Sauroposeidon proteles
Sauroposeidon and Patagotitan represent convergent evolution toward extreme size in sauropods from different continents and titanosauriform lineages.
Carcharodontosaurus
Carcharodontosaurus saharicus
Carcharodontosaurus and Giganotosaurus (Patagotitan's formation-mate) were both carcharodontosaurids that evolved massive size likely as a response to hunting giant sauropods on their respective continents.