The Krogan are a fictional alien species from the Mass Effect video game series. They are known for their large, muscular bodies, tough skin, and distinctive, reptilian features. Originally from the planet Tuchanka, Krogan culture is heavily influenced by their history of warfare and survival in a harsh environment. Krogans are characterized by their resilience and regenerative abilities, allowing them to recover from injuries quickly. They have a complex social structure, often organized into clans, and are known for their aggressive nature. The Genophage, a biological weapon used against them, significantly reduced their birth rates, impacting their population and culture.