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Chelonia mydas
Diet
Seagrass and algae as adults; omnivorous as juveniles
Habitat
Coastal seagrass beds and reefs; nests on sandy beaches
Range
Circumtropical; regionally including the Sulu Sea, Sabah's Turtle Islands and Sipadan
Clutch size
About 100–120 eggs per clutch, several clutches per season
Incubation period
About 45–70 days, temperature-dependent
Size
Large (carapace up to ~1.2m)
Weight
Up to ~150kg
The only sea turtle that becomes predominantly herbivorous as an adult, grazing seagrass beds and algae — a diet that gives its body fat a greenish colour and the species its common name. Juveniles are more omnivorous, taking jellyfish and other invertebrates before shifting to plants.
Sabah's Turtle Islands Park and Sipadan are among the region's best-known nesting and feeding sites; females return to natal beaches to lay eggs, digging a nest chamber above the tideline before covering it and returning to the sea.
Endangered, with historical declines driven by egg harvesting, hunting for meat and shell, and ongoing threats from fisheries bycatch and coastal development at nesting beaches.