Megalonyx sloths grew to around 9.8 feet (3 meters) long and weighed up to 2,205 lbs. (1,000 kilograms), according to the San Diego Zoo. Giant ground sloths ( Megalonyx jeffersonii ) stood about ...

Ground sloths emerged in South America tens of million years ago, eventually ranging as far north as Canada. While their modern relatives dwell in trees and top out at the size of some smaller dog ...