Great Jagras greatly resembles an Iguana in appearance. It has light green scales with blue and reddish stripes covering its body, while its underbelly is blue in color. Great Jagras has multiple spikes running down its back and has a long patch of greenish fur on the back of its head.
Great Jagras is able to swallow large prey whole in one gulp, allowing it to use its immense weight to fight off any potential threats.
Great Jagras are quite calm monsters, but will attack if disturbed or threatened.
Great Jagras can be seen inhabiting the Ancient Forest.
- Great Jagras is the leader of the Jagras.
- Great Jagras is known to leave slide trails on the ground.
- Great Jagras's head, front limbs, back limbs, belly, and tail can be wounded.
- Great Jagras will spit out whatever it has eaten if it takes too much damage while its stomach is bloated.
- Great Jagras won't attack a hunter unless they attack it. Though Great Jagras won't attack hunters unless disturbed, it will attack an Anjanath on sight.
- In the Ancient Forest, Great Jagras is low in the food chain. So far, it is outclassed by both Anjanath and Rathalos in that location.
- Great Jagras attacks can greatly vary in battle, depending on whether it has eaten anything or not. When it has eaten, it'll try to use its own weight to crush hunters.
- Great Jagras is known to regurgitate food in order to feed the Jagras.
- By studying how reptiles increase in size after eating, the develops for Monster Hunter: World were able to create Great Jagras.