Why do turtles bask in the sun so often?

As ectothermic reptiles, turtles depend heavily on outside heat to raise their body temperature. Basking speeds digestion, improves movement, and supports normal daily activity. Some turtles also use sunlight exposure to help their bodies process calcium and maintain healthy shells and bones. Because water can be cooler than land, basking platforms, logs, and banks are important parts of turtle habitat. This behavior is one of the simplest and most visible ways reptiles regulate body functions.