Before revision: Historical declines Historically, the Quaternary extinction event was the most dramatic episode of wild mammal decline, as it saw the disappearance of appromixately half of all terrestrial mammal species with a body mass greater than 40 kg.
After revision: Declines in geologic timeframes Historically, the Quaternary extinction event was the most dramatic episode of wild mammal decline, as it saw the disappearance of appromixately half of all terrestrial mammal species with a body mass greater than 40 kg.