Asperdorsus is a fictional species of dinosaur that was created for Peter Jackson's 2005 film King Kong, but that did not make it into the film. However, they were documented as a real part of Jackson's Kong lore in the 2005 supplementary book, The World of Kong.
Asperdorsus were the second largest animal on Skull Island, dwarfed only by their Brontosaurus cousins. In addition to the heavy armor Asperdorsus was covered in, they bore long crests of spike-like protrusions from their backs and the undersides of their necks. Compared to the Brontosaurus, the Asperdorsus has long limbs and high bellies which were helpful adaptations for moving through the thick jungle vegetation. Because of their relatively narrow build, they needed a long tail to balance their long neck.
The name Asperdorsus comes from the Latin word for rough, "Asper" and the words "dorsum" and "dorsalis", which refer to the back.
Despite their size, the lanky build of the Asperdorsus allowed them to maneuver adeptly through their thickly wooded habitat, where they grazed the relatively untouched midlevel foliage. The eternal darkness of the jungle floor necessitated the Asperdorsus' developing a strong sense of smell, which lead them to their favorite food species. Asperdorsus were particularly fond of the fruits that grew at their grazing level, which ripened at different times of the year. Because of this, their slow and meandering migration could easily be mapped in accordance to which fruits were in season. In addition to their spikes, their heavily armored bodies prevented attacks from most predators. Only Venatosaurus and Carvers were smart enough to attempt to take down an Asperdorsus while being wary of their powerful tails, a blow from which could break bones.
While they lived in solitude for most of the year, when it came time to breed, Asperdorsus located one another with low frequency vocalizations produced in their stomachs. Males tried to impress females by using their tails to level small patches of forest by clearing brush and pushing over small trees. Females would choose whichever male was the largest and most destructive performers to father their young.
- Asperdorsus long tails could be swept aside with such force that a blow from its tail could break bone.
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