Magyarosaurus

Magyarosaurus was an exceptionally small titanosaur that lived in what is now western Romania during the latest Cretaceous period, roughly 70 million years ago. While most of its sauropod cousins ranks among the largest terrestrial animals ever to exist, Magyarosaurus was scarcely larger than a modern draft horse, reaching roughly six metres from snout to tail tip. Microscopic examination of its fossilised limb bones confirmed that these specimens belonged to mature adults rather than young giants, providing a classic textbook example of insular dwarfism. Trapped on the prehistoric landmass known as Hateg Island, the ancestors of Magyarosaurus adapted to restricted land area and patchy resources by shrinking over evolutionary generations. As a herbivore, it cropped ferns and conifers close to the forest floor, relying on its compact frame and bony skin armour for survival.

Bone histology proves this pony-sized sauropod was a fully grown adult dwarf, not a juvenile.

Where and when

Magyarosaurus lived in the Late Cretaceous, from 72.1 to 66 million years ago (Maastrichtian age). Its remains come from Romania, in the Sânpetru Formation.

The numbers

Length 5.5 m (estimates run from 5 to 6 m). Mass about 910 kg. Hip height about 1.3 m. That is 3.2 human-lengths, or 0.49 of a double-decker bus. These are estimates from partial skeleton; fields marked estimated by the site are length, mass, hip height.

Compare Magyarosaurus with a bus Place on the timeline