The hanuhan lives in small family groups, usually scattered over a wide area of mountainside. The food is so sparse at altitudes of about 4,000 meters (13,500 feet) that larger concentrations of animals would not survive. The agility of the hanuhans enables them to move from one bleak pasture to another with ease, hopping and leaping from rock to rock, balanced by the stiff rod of the tail.

The Hanuhan, Grimposaurus pernipes, is a fleet-footed hypsilophodont from the barren mountains of the Himalayas, in The New Dinosaurs: An Alternative Evolution.

Up towards the snowline of the greatest mountain range on Earth, the Himalayan range that divides the Indomalayan from the Palaearctic realm, there is very little to support life. Yet even these bleak regions have a number of highly adapted animals.

The hanuhan is a dinosaur that has evolved to live in these harsh conditions. Its adaptations are similar to those of the balaclav thescelosaur of North America: deep layers of fat for insulation, and strong claws and beak for scraping the sparse plant and fungus material (mosses, lichens and other alpine plants) from the rocks crannies. Like the balaclav, it has evolved from the successful hypsilophodonts of the Cretaceous period. As such, it has probably come into the Indomalayan ecozone across the vast Himalayan mountains from the Palaearctic ecozone, rather than having been brought up from India in the south, during its long life as an island continent. It is a very nimble animal, sure-footed on crags and confident on the narrowest of ledges. The brain has developed well to control balance and muscular coordination. It could be that the hanuhan evolved from partly tree-living hypsilophodonts,before developing adaptations suitable for its mountaineering lifestyle.

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