6. Ground Sloth
When you think of sloths, you think of small, furry mammals that move at a leisurely pace. Their ancestors were anything but small! Megalonyx, Greek for Large claw, is an extinct genus of ground sloths that lived on Earth for over 10 million years. They migrated from South America to North America and typically lived near areas with lakes, rivers, and forests.
Ground sloths fared best in warm environments and traveled south when it got too cold in Alaska and the Yukon. These giant animals fared better in habitats that mixed conifer-hardwood and spruce trees. They were nearly 10 feet tall and weighed roughly 2,205 pounds. They were tall enough to perch on their hind legs and feed on trees. They most likely survived up until about 11,000 years ago.