Advancing sea turtle photo-ID research with artificial intelligence
For long time now, sea turtle researchers have been exploiting the unique scale pattern of sea turtle individuals to identify them from images and study several aspects of their ecology and biology. These patterns are unique to every individual and stay stable in time (like human fingerprints!). The process, called sea turtle photo-identification (photo-ID), is nowadays used in projects all over the world and examples of studies facilitated by it include in-water behaviour studies, occurrence of injuries, progress of diseases, population monitoring and measuring ecotouristic impact on individual turtles.
The way sea turtle photo-ID is traditionally done is via comparing the facial geometric scale patterns of the same sides of turtles’ heads. This is because these are different from side to side on any individual sea turtle. Therefore, any new image showing the profile of an individual (left or right) is only compared to images of previously identified individuals showing the same side (left or right).
A recent study used artificial intelligence to push the boundaries of the method. The study was led by Kostas Papafitsoros, long term member and researcher of ARCHELON and Lukáš Adam, a researcher from Czech Republic who had also been volunteer in ARCHELON Zakynthos project. ARCHELON’s scientific committee member, ALan F. Rees, also participated in the study.
One of the main findings was that the similarity of left and right profiles of the same turtle is higher than the similarities of profiles of different turtles.
Try to verify that yourself! Can you match the left side of "Viktoria" with her right side?
The same study showed that artificial intelligence algorithms, including one previously developed by the team, can detect this left-right similarity in three sea turtle species. The algorithms can match left and right profiles of the same individual sea turtles which have otherwise no spatial overlap. This results in higher photo-ID matching accuracies and in the future, it might be sufficient to photograph only one side of a turtle’s face when collecting photo-ID data, allowing for more flexible data collection protocols.
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RECENT NEWS
- OUR NEWS14/08/2025
ARCHELON’s Life-Saving Chain with the Support of the Green Fund
Thanks to persistence, medication, daily care, and a great deal of patience, “Snowball” gradually moved from a critical state to full recovery.
- OUR NEWS31/07/2025
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- OUR NEWS25/07/2025
New Info Station in Kyparissia Opens for LIFE MareNatura Project
Located at the beachfront of the town, the Info Station operates daily 18:30 - 21:00.
- OUR NEWS21/07/2025
Public Excavations of Sea Turtle Nests in Crete
The excavations are open for both kids and adults and take place on the nesting beaches of Rethymno, Chania, and the Messara Bay during the months of August and September.
- OUR NEWS21/07/2025
Public Excavations of Sea Turtle Nests in the Peloponnese
The excavations are open for both kids and adults and take place on the nesting beaches of Kyparissia Bay, Romanos, Koroni and Lakonikos Bay during the months of August and September.
- OUR NEWS16/07/2025
Earlier than ever before was the start of the 2025 Hatching Season of Loggerheads in Greece – The first hatchlings have reached the sea!
We are excited to announce the beginning of the 2025 sea turtle hatching season, with the earliest hatching event ever recorded since monitoring began in 1984.
- OUR NEWS15/07/2025
Important presentations at the 16th International Congress on the Zoogeography and Ecology of Greece and Adjacent Regions (ICZEGAR)
ARCHELON actively contributed to the Congress with three oral presentations, highlighting key aspects of its scientific and conservation work for sea turtles.
- OUR NEWS09/07/2025
Inspections in Zakynthos and Kyparissia by representatives of the Bern Convention
The experts were in Greece to monitor the implementation of the Recommendations adopted by the Standing Committee of the Bern Convention to our country regarding the protection of the Loggerhead sea turtle and the ongoing threats faced by the species in its largest breeding habitats in the Mediterranean.
- OUR NEWS02/07/2025
Citizen Science: Recording of Sporadic Nesting of Sea turtles across the Aegean
For over four decades, many people have been reporting turtle sightings and tracks across the Greek coastline. Thanks to them, we have confirmed 577 unique nesting events outside our regularly monitored areas
- OUR NEWS01/07/2025
Satellite Tagging Completed and Captured on Film in Crete
ARCHELON has just successfully completed the 2025 deployment of satellite transmitters on Loggerhead Sea Turtles (Caretta caretta) in Crete, as part of the ongoing LIFE MareNatura Project. This year’s work in Crete was extra special: the LIFE MareNatura Documentary team joined us in the field!
- OUR NEWS23/06/2025
Enjoy the Beaches Responsibly: Together We Protect the Sea Turtles of Kyparissia Bay!
So far, more than 2,000 nests have been recorded in the area. In order to best manage the protected beaches, we have adapted our field work protocols.
- OUR NEWS16/06/2025
World Sea Turtle Day: We can all live together!
Today, June 16th, we celebrate World Sea Turtle Day. On this occasion, ARCHELON expresses its warmest thanks to all citizens, volunteers, donors and supporters who actively contribute to our work.
- OUR NEWS10/06/2025
New Adaptation Strategies for Sea Turtles and Mediterranean Monk Seals
Institutions, associations and researchers will work for 5 years alongside the coastal communities to evaluate and respond to the effects of rising sea levels and ocean warming. These are to be developed through the ‘LIDE ADAPTS’ project which is being carried out in Italy, Greece and Cyprus.
- OUR NEWS08/06/2025
World Oceans Day: Conservation and Anthropogenic “Wounds” in Laganas Bay, Zakynthos
On the occasion of World Oceans Day, ARCHELON brings to the fore the challenges facing Laganas Bay, Zakynthos - one of the most important refuges of the loggerhead sea turtle in the Mediterranean.
- OUR NEWS06/06/2025
Sekania: History of the most precious refuge for the Loggerhead in Zakynthos
Sekania, a secluded 600-meter-long beach in Zakynthos, is a global model of success in biodiversity conservation, with more than 24,000 sea turtle nests recorded over the last 40 years.