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One of the Tyrannosaurus principle sources of prey are these bulky Torosaurus, the magnificent, majestic bull of the rehistoric period. In the Late Cretaceous, herds of horned herbivores like these were very common...an attracted many predators.
— Allen, on Torosaurus
  

Torosaurus (tor-o-saw-us; meaning "Bull Lizard") was a bulky herbivorous chasmosaurine ceratopsian dinosaur that lived in the Late Cretaceous (70-65) of the Western United States. It related to Triceratops, but at about 8-9 meters (25-28 ft) in length and weighing an estimated 6-7 tonnes, it was smaller and lighter than Triceratops.  

FactsEdit

Time/Era/PeriodEdit

Torosaurus lived in western North American during the Late Cretaceous period from 70-65 million years ago. It lived alongside dinosaurs like Edmontosaurus, Ankylosaurus, and Late Cretaceous mammals. It was also often hunted by Dromaeosaurus and Tyrannosaurus Rex as a principle source of food.

Size/DescriptionEdit

Torosaurus

Known for being the magnificent and majestic bull of the Late Cretaceous Period, Torosaurus was the second largest member of the ceratopsian family, after Triceratops. It was about 8-9 meters (25-28 ft) in length and weighing an estimated 6-7 tonnes.

Torosaurus had a similar stance to that of a rhinoceros. With its formidable horns and powerful, muscular body, Torosaurus was like a dinosaur version of a rhinoceros. It featured a large, enormous bony neck frill with large fenestration, or horns, which were used for display, Torosaurus had the largest skull of any terrestrial animal. The bony frill had large fenestrae, or holes, to reduce weight and may have been brightly coloured and used for display. Apart from the large frill, Torosaurus was similar in appearance to its close relative, Triceratops. Torosaurus had two, large, long horns sprouting above the eyes with a smaller horn on the snout. They used their sharp beaks and rows of shearing teeth to munch tough vegetation.

Fossilized footprints identified as ceratopsian track-ways indicate that the forelegs were slightly splayed, with the hind legs straight under the body, similar to a rhinoceros.

BehaviorEdit

Like all herbivores and ceratopsian dinosaurs, Torosaurus lived and traveled in herds. Although Torosaurus had among the longest skulls of any land animal ever, they were relatively sociable dinosaurs – one of the kinds of dinosaurs that liked to live in herds, however they were sociable up to a point. The dominant males were very territorial, as they could dominate their herds for decades and were masters of their turfs.

During the rutting season, to display, the males flushed blood into their crests, creating vivid patterns, similar to how a Stegosaurus flushed blood into their plates. A Torosaurus's huge crest is their reproductive display. For the males, their horns and crest earn them status.

Torosaurus in fight

Torosaurus against Torosaurus

With massive heads and safety in herds, not much on Earth that could threaten Torosaurus, except not just Tyrannosaurus Rex, but also another Torosaurus. For Torosaurus, these displays on their frills were designed to avoid physical contact. With one-meter long horns, fighting could easily result in bad injuries. The best and brightest displayed crest was usually all that was needed to settle arguments. Occasionally, showing off was not always enough, and although fighting was usually a last resort for a Torosaurus, the males resorted to brute force. And in the end, it was the male with the biggest head that won.

Often in Torosaurus fights, youth triumphed over experience. When younger male Torosaurus reached a certain age in adult hood, at the very least maturity, they would challenge the older males authority as leader of the herd. And if younger Torosaurus won in fighting against older and more experienced male Torosaurs, the old male would therefore not only have lost, but would also surrender to his younger opponent. Little Torosaurus

GalleryEdit