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Gorillas in the Mist is the title of Dian Fossey's book, which chronicles her 13-year study of mountain gorillas in Rwanda's Virunga Mountains. Fossey's research, which began in 1967, provided groundbreaking insights into the behavior and social structure of these endangered primates. Her work also brought international attention to the plight of gorillas, highlighting the threats they faced from poaching, habitat loss, and political instability.