<human>:  Could you explain the difference between a tortoise and a turtle?
<bot>: The primary difference between a tortoise and a turtle is that tortoises are land-dwelling reptiles while turtles live in water. Turtles typically have smooth shells and webbed feet to aid in swimming, whereas tortoises have heavier, more ridged shells for protection and sturdier feet for walking on land. Turtles also tend to be much more aquatic than tortoises, spending more time in water and swimming greater distances, whereas tortoises prefer drier habitats and rarely swim.