Heavy creatures, krogan have been known to weigh at least 150 kilos, upwards of nearly 200 kilos for above-average specimens. When they grow older the plates grow together to form one whole. Younger krogan tend to have looser plates on their head with soft spots in between. These markings darken to brown or tan over time, showing their age. Younger krogan have yellow or green markings on their hides. Consequently their diets can include food and drink which would prove very dangerous to other species-a fact reflected in the krogan liquor of choice, ryncol, which is said to "hit aliens like ground glass". 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. A bigger shoulder hump is seen as a sign of high status, showing how successful an individual krogan is at hunting. In particular they require very little water intake a 55-gallon tank system can sustain an entire colony of krogan for over 10 years. Their large shoulder humps store fluids and nutrients, enabling them to survive extended periods without food or water. In present conditions, according to EDI, the odds of a krogan successfully giving birth to two females stand at 1 in 2,000, though krogan biology is slowly adapting to the virus. Females are known to produce clutches of up to 1,000 fertilized eggs over the course of a year. Prior to the genophage, krogan could reproduce and mature at an astonishing rate. Their irises may be red, green, amber, or blue in color. Unlike most sentient species, krogan eyes are wide-set - on Earth, this is common among prey animals, and in this case it gives the krogan 240-degree vision, giving them greater visual acuity and awareness of approaching predators. This genetic "infection" dramatically reduced fertility in krogan females, causing a severe drop in births secondary to prenatal and postnatal death and, ultimately eliminating the krogan's numerical advantage.ĭue to the brutality of their surroundings, natural selection has played a significant role in the evolution of the krogan. Ironically, after the rachni were eradicated, the rapidly-expanding krogan became a threat to the galaxy in turn, starting the Krogan Rebellions and forcing the turians to unleash the genophage.
With the help of the salarians, the krogan were "uplifted" into galactic society, and lent their numbers and military prowess to bring an end to the Rachni Wars. The end result is that they destroyed their homeworld in a nuclear war that reduced their race into primitive warring tribes. Unfortunately, as krogan society became more technologically advanced, so did their weaponry. The krogan managed to not only survive on their unforgiving homeworld, but actually thrived in the extreme conditions. 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.
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