
Giant Ice Age Sloths Likely Carved 600-Yard Tunnels Beneath South America
Scientists have mapped hundreds of massive tunnels up to about 6 feet wide and as long as 600 yards across southern Brazil and northern Argentina, arguing they were carved by giant Ice Age sloths rather than humans or natural geological forces. The walls show claw marks and signs of reuse, suggesting these tunnels were maintained over time and serve as trace fossils revealing ancient habitats and megafauna behavior like Megatherium rather than predator activity.













