The last and largest of the group and only one found in North America, Alamosaurus, was thirty-four metres (112 feet) in length and one of the last sauropods to go extinct.

Like all sauropods, the saltasaurids were quadrupeds, their necks and tails were held almost parallel to the ground, and their small heads had only tiny, peg-like teeth.

As sauropods, the Saltasauridae are herbivorous saurischians with the characteristic body plan of a small head, long neck, four erect legs, and a counterbalancing tail.

Paleontologists J Wilson and P Upchurch defined the Saltasauridae in 2003 as the least inclusive clade containing Opisthocoelicaudia skarzynskii, and Saltasaurus loricatus, their most recent common ancestor, and all that species’ descendants.

Saltasaurus Many fragmentary saltasaurids have been discovered since 1980, placing members of the family in territories as widely dispersed as today's Australia, Madagascar, and France, in addition to their earlier-known residencies in North and South America.

[17] Unable to chew and probably lacking gastroliths, sauropods survived by retaining plant matter in their stomachs for long periods of time, fermenting it to extract as many resources as possible.

Analysis of the osteoderms of the titanosaur Rapetosaurus revealed that the bones were hollow in adults, while those of juveniles were solid pieces similar to those in crocodiles.

Paleontologist Kristina Curry Rogers, who made this discovery, theorized that the adult animals used their hollow osteoderms to store minerals during lean times.

The embryos show smaller rostrum and nares close to the anterior portion of the face compared to adult titanosaurs, suggesting that the nostrils may have moved towards the back of the head as the animal grew.