Green Sea Turtle - National Geographic Kids

Female green turtles emerge at night to deposit eggs, the process taking an average of two hours. Up to seven clutches are deposited at 12 to 14 day intervals, but the average is probably two or three clutches. Accurate counts of the number of clutches per season are difficult to get. The average clutch size is 100-110 eggs.

Climate change does weird things to endangered green sea turtles.

Green sea turtles are the world’s largest species of hard-shelled sea turtle

The Hawaiian Green Turtle - A Sea Turtle Page

The hatching success of undisturbed nests is typically high. The Hawaiian green turtle enjoys the benefits of a protected and isolated nesting habitat and low levels of predation. Unlike many nesting areas throughout the world, there are no nest-raiding predators (not even humans) in the French Frigate Shoals. Ghost crabs prey upon hatchlings, but estimates of losses to crabs do not exceed 5%. Unlike other nesting beaches throughout the world, hatchlings are not greeted by predatory birds, and the loss to carnivorous fishes does not appear to be significant. Hatchlings in the French Frigate Shoals do not suffer from human interference either; there are no distracting lights from developments and no destructive beach activities.

Green Sea Turtle - Sea Turtle Facts and Information

The navigation feats of the green turtle are well known, but poorly understood. We know that hatchlings and adult females on the nesting beach orient toward the ocean using light cues. For a long time, no one knew what cues were employed in pelagic movements, in movements among foraging grounds, or in migrations between foraging grounds and nesting beaches. Recently published work, however, has suggested that the earth's magnetic field plays a role in these feats.

99% of Australian Green Sea Turtles Studied Turning …

Sea Turtle Conservation | Gumbo Limbo Nature Center

Hawaiian green turtles nest in the isolated French Frigate Shoals, but forage throughout the entire Hawaiian Archipelago, a range of 2450 km. Tagging has indicated that most Hawaiian green turtles seem to settle at a specific foraging ground and leave only to reproduce. Our observations at Honokowai strongly support this theory, since we have seen the same core group of animals every year since 1989.

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Females deposit egg clutches on beaches in the French Frigate Shoals, digging a deep nest cavity above the high water line. Eggs incubate for approximately 65 days before hatching. Hatchlings leave the beach and apparently move into convergence zones in the open ocean where they spend an undetermined length of time. Hawaiian green turtles reach a carapace length of approximately 35 cm, about 10 cm larger than juveniles of other green turtle populations, before leaving the pelagic habitat and entering benthic feeding grounds.

Green Sea Turtle - Kids - National Geographic Kids

Scientists assume that post-hatchling, pelagic-stage green turtles are omnivorous, but there are no data on diet from this age class. Our personal experience with juvenile Hawaiian greens that appear to have just arrived inshore supports this theory. Our first turtle encounter resulted when a juvenile swam up to us and attempted to take some of the cuttlefish we were using to attract eels for photographs. We have since observed juveniles eating sponges and seaweed, as well as jellyfish.

Chelonia mydas (Green Turtle) - IUCN Red List

One interesting discovery in recent years is that incubation temperatures determine the sex of hatchling turtles. In 1985, Standora and Spotila reported this effect on green turtles. Eggs incubated below a pivotal temperature--which might vary among populations--produce primarily males, and eggs incubated above this temperature produce primarily females.

Types of Sea Turtles - Sea Turtle Facts and Information

One interesting behaviour of the Hawaiian green turtle is its fondness for crawling ashore at isolated sites in order to bask. Basking is rare among marine turtles, and has been observed in only a few populations in the Pacific. Hawaiian green turtles bask, but this behaviour seems to be limited to the Northwestern Hawaiian Islands. It is thought that they do this for thermoregulation (they like to warm up in the sun), resting (they like to sleep in the sun), and perhaps for protection from tiger sharks (they don't like to be eaten). Sounds just like people to us.