Before revision: A 2015 study, the San Diego Zoo , surveyed results from 36 different mammalian species, ranging in size from the 51-gram striped grass mouse to the 4,800-kilogram elephant, nearly 100,000 times larger .
After revision: In a 2015 study the San Diego Zoo , surveyed results from 36 different mammalian species, ranging in size from the 51-gram striped grass mouse to the 4,800-kilogram elephant nearly 100,000 times larger .