Endangered
IUCN Red List
Global conservation priority
150 kg
Average Weight
Largest hard-shelled turtle
70+ Years
Lifespan
In undisturbed wild habitats
35 km/h
Burst Speed
Hydrodynamic flipper power
Biological Profile & Field Identification
The Green Sea Turtle (Chelonia mydas) is the world’s largest hard-shelled marine turtle and the most commonly encountered species for recreational snorkelers worldwide. Despite its common name, the Green turtle’s smooth carapace (top shell) is not bright green; it displays rich mottled patterns of olive, amber, black, and golden brown. The species gets its common name from the greenish hue of its subdermal body fat, a direct result of its specialized adult diet consisting almost entirely of marine vegetation.
Key Anatomical Characteristics
- Single Pair of Prefrontal Scales: Look closely between the turtle’s eyes. Green sea turtles have only one pair of elongated prefrontal scales (unlike Hawksbills and Loggerheads, which possess two pairs).
- Smooth, Non-Overlapping Carapace Scutes: Four large lateral (costal) scutes on each side that meet edge-to-edge in a smooth, seamless teardrop contour.
- Serrated Lower Jaw: Specially adapted like underwater garden shears to cleanly crop seagrass blades close to the seabed without uprooting the root rhizomes.
💡 Where to Spot Foraging Green Turtles
Because adult Green turtles graze on seagrasses (*Thalassia testudinum* and *Halodule wrightii*), focus your snorkeling over shallow, sunlit sandy lagoons between 1.5 and 4 meters deep. Watch for small clouds of sediment and telltale trimmed grass trails.
Top Global Sanctuaries to Swim with Green Turtles
- Akumal Bay (Riviera Maya, Mexico) — Protected shallow lagoon with high-density seagrass meadows.
- Turtle Canyon (Waikiki, Oahu, Hawaii) — Famous oceanic cleaning station where surgeonfish groom resident Honu.
- Turtle Point (Gili Meno, Indonesia) — Crystal-clear waters with calm drift snorkeling over resident turtles.
- Abu Dabbab Bay (Marsa Alam, Egypt) — Giant Red Sea Green turtles reaching over 1.5 meters in carapace length.
- Apo Island (Philippines) — Community-managed marine sanctuary with turtles grazing in knee-deep water.
