Add Yahoo as a preferred source to see more of our stories on Google. Turtles and tortoises are both reptiles with shells, but they're not exactly the same. So how can you tell them apart? What's the ...

At first glance, turtles and tortoises seem almost interchangeable. Both carry a shell, move at an unhurried pace and belong to the same ancient reptile lineage that has existed for millions of years.