Terrestrial basking

Turtles usually only come ashore to nest. It is rare to see a marine turtle on land otherwise. But it does happen: at certain beaches turtles come ashore to bask in the sun during the day. The only species known to exhibit this unique behaviour is the green turtle. It regularly comes to bask on the beaches of Hawai’i, and there have also been reports of turtles basking in the Galápagos Archipelago and in Western Australia. While basking the turtles will seemingly close their eyes and fall asleep. This creates the unique situation for beach goers to have to share the beach with napping turtles!

The obvious benefit of basking for reptiles is thermoregulation: raising body temperature accelerates metabolic processes like digestion and growth. Being cold-blooded, this is probably the main reason why these green turtle bask and nap on land. A possible added benefit of being on land is the reduction in exposure to marine predators such as tiger sharks. Finally, it could be that staying on land is also more energy-efficient as the turtle does not have to periodically swim to the surface for air. There are turtles that seem to prefer to bask at the same spot every day. On some beaches, tape is placed around the turtles’ favourite sleeping spots to ensure the turtles can rest undisturbed. It is also reported that certain groups of turtles always bask together, like friends. Occasionally Hawaiian monk seals also join the turtles for their nap, like in the pictures below!

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A big thank you to Mark Sullivan for all the great pictures of the turtles with the seals. Check out his great work with Hawaiian monk seal! I also thank Rebecca Scott for the original post idea.

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