Here's why:
* Sunlight: The epipelagic zone is characterized by ample sunlight, allowing for photosynthesis by phytoplankton, which form the base of the food web that green sea turtles rely on.
* Warm temperatures: This zone also has warmer temperatures, suitable for the turtles' metabolic needs.
* Food availability: Green sea turtles are herbivores, primarily feeding on seagrass and algae, which thrive in the well-lit epipelagic zone.
While green sea turtles may occasionally venture into deeper waters, they primarily spend their time in the sunlight zone for foraging and other activities.