Ground Sloths vs Extinct Armadillos

Giant ground sloths and a extinct species of armadillos were the main contenders. They also had on coming back to our example earlier, they had the muscle to back it all up. Their claw hands have these closely spaced, thick fingers that make for natural as when applied against soft rock. He compares it to the muscles necessary for a galloping power, like a galloping horse, except that in this case it's applied to digging.