Krogan

 Krogans(Grunt and Urdnot Wrex) 

From the game
Mass Effect

The krogan are a species of large reptilian bipeds native to the planet Tuchanka, a world known for its harsh environments, scarce resources, and overabundance of vicious predators. The krogan managed to not only survive on their unforgiving homeworld, but actually thrived in the extreme conditions. Unfortunately, as krogan society became more technologically advanced so did their weaponry. 

Due to the brutality of their surroundings, natural selection has played a significant role in the evolution of the krogan. Unlike most species on the Citadel, krogan eyes are wide-set - on Earth this is distinctive of prey animals, but in this case it gives the krogan 240-degree vision, giving them greater visual acuity and awareness of approaching predators.

Their large shoulder humps store fluids and nutrients, enabling them to survive extended periods without food or water. A bigger shoulder hump is seen as a sign of high status, showing how successful an individual krogan is at hunting. Their thick hides are virtually impervious to cuts, scrapes or contusions, and they are highly resistant to environmental hazards, including toxins, radiation, and extreme heat and cold. Consequently their diets can include food and drink which would prove very dangerous to other species.