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The Late Cretaceous titanosaur from Western North America. Found across the southwestern United States, fragmentary remains from Mexico suggested Alamosaurus may have challenged as the largest land animal of all time. Tyrannosaurus rex (or a close relative) lived alongside, and presumably hunted Alamosaurus.
The reconstruction here is a composite of multiple specimens, including the complete, adult neck vertebrae from the Perot Museum of Nature and Science (BIBE 45854). As the largest substantive specimen, the length estimate is scaled to BIBE 45854.
That’s already a large dinosaur, but it’s currently debated whether fragmentary remains from Mexico are also Alamosaurus. A partial tibia (shin bone) records a true behemoth, a titanosaur close to 30 meters in length, that would have challenged Argentinosaurus and Patagotitan for the largest known land animal.
