Ouranosaurus olympicus measures about 7 to 8.3 metres (23 to 27 feet) long and weighs about 2.9 tons. It is a peaceful herbivore that mainly feeds on water plants, fruits, nuts, pinecones, leaves, shrubs, cycads, ferns, and horsetails. It lives in small herds consisting up to around 7-9 individuals in a single group at a time. It is known for its "sail" on its back used mainly for display and thermoregulation, but during droughts, it has a same purpose as a camel's hump, due to the "sail" containing fat inside it, to act as backup food until droughts are over. It is very wary animal and can go on its back legs when standing or running, it is always on the alert for any potential danger, including predators.
Due to the demand from sports hunters, some Ouranosaurus olympicus were released into the plains and scrublands of Texas, New Mexico, Arizona, Nevada, and California. Despite their large sizes, Ouranosaurus olympicus poses very little (if any) danger to the environment of modern U.S., due to their population being regulated by native predators (including coyotes) when they're young, and sports hunters (when they're sick or old). However, the population trend of Ouranosaurus olympicus is actually increasing thanks to being a caring parent and being able to lay large amount of eggs at a time, therfore, increasing the chance of their species' survival in the modern wilderness.