Green Sea Turtle
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40 free Green Sea Turtle trivia questions with answers — trivia quiz, new questions added Oct 2026.
The green sea turtle is the grazer of the turtle world: a heavy, placid swimmer that crops underwater meadows in warm lagoons and then crosses whole oceans to breed. Its name is one of the best-known puzzles in natural history, because the animal you see is not especially green at all. This quiz turns the best green sea turtle fun facts into questions. It covers what the adults eat, how hatchlings find the sea, what decides whether an egg becomes a male or a female, how the turtles steer across open water, where the biggest nesting colonies are, and how a centuries-old appetite for turtle soup nearly finished the species off. It suits beach lovers, snorkelers, students, teachers planning an ocean unit and anyone who has watched a turtle surface for air. Every answer comes with a short explanation, so you finish with a few did-you-know facts worth passing on.
30 of 40 questions with answers and explanations. Play the quiz
Q 01The green sea turtle is named for the color of which part of the animal, long prized by soup makers?
Its fat
Its fat gives the green sea turtle its name: a greenish layer lies between its organs and its shell. The shell itself is usually olive or brown.
Q 02Which laid-back green sea turtle rides the East Australian Current with his son Squirt in Finding Nemo?
Crush
Crush is voiced by the film's own director, Andrew Stanton. The character teaches Marlin, the anxious clownfish father, to relax about his missing son.
Q 03Green sea turtles are the only sea turtles that commonly do what on land, as on some Hawaiian beaches?
Bask in the sun
Bask in the sun is the answer: males and females alike haul out to warm up. They sometimes flick sand over their backs so the surface of the body does not overheat.
Q 04When green sea turtle soup grew scarce and costly, cooks made a mock version from which farm animal?
Calf
Calf meat, chiefly from the head, copied the texture of the real thing. That is why the Mock Turtle in Alice's Adventures in Wonderland is drawn with a calf's head and feet.
Q 05Which food, grazed in warm shallow lagoons, makes adult green sea turtles the only plant-eating sea turtles?
Seagrass
Seagrass is the adult staple, eaten along with algae. Hatchlings start out eating small animals and switch to plants as they mature.
Q 06What decides whether a green sea turtle egg hatches male or female, a growing worry as nesting beaches warm?
Nest temperature
Nest temperature decides it: warmer nests hatch females and cooler ones males. Even within one clutch, eggs in the warm middle tend to hatch as females.
Q 07Which ocean hunter is the main predator of adult green sea turtles, often striking near their nesting beaches?
Tiger shark
Tiger shark jaws can tackle green sea turtles of every size. The sharks patrol close to nesting beaches, where the turtles are hemmed in and easier to catch.
Q 08What color is the upper shell of a newly hatched green sea turtle, set off by a pale underside?
Black
Black is the hatchling color on top, with a light belly below. The shell turns brown or olive as the turtle grows, and adults often carry marbled or rayed patterns.
Q 09A green sea turtle on a beach can seem to weep because glands behind its eyes are getting rid of what?
Excess salt
Excess salt from swallowed seawater collects in glands behind the eyes and is then pushed out. On land the briny trickle looks just like tears.
Q 10Where does a female green sea turtle usually lay her eggs, even if it means swimming 2,600 km?
Her own birth beach
Her own birth beach is the usual choice, a habit called natal homing. Males make the same trip, since the females born there are sure to come back to breed.
Q 11Raine Island, the world's largest green sea turtle rookery, sits on the outer edge of which coral system?
Great Barrier Reef
Great Barrier Reef waters surround the tiny cay, where tens of thousands of females can nest in one season. Engineers reshaped it with heavy machinery so fewer turtles died on its small sand cliffs.
Q 12Which US state, home to Hutchinson Island, has the country's biggest green sea turtle nesting beaches?
Florida
Florida's east coast is the largest green turtle nesting area in the United States. Beaches there are cordoned off or closed for parts of the year to keep the nests safe.
Q 13Why do towns beside green sea turtle nesting beaches ask residents to switch off or shield seafront lamps?
Q 21Which Pacific archipelago, where William Dampier noted them in the 1600s, hosts an unusually dark green sea turtle?
Galápagos Islands
Galápagos Islands green turtles are smaller and far darker than most, and were once classed as a separate species. They get little attention beside the islands' giant tortoises.
Q 22Fibropapillomatosis, a disease seen mostly in green sea turtles, produces which growths in and on the body?
Tumors
Tumors can grow large enough to stop a turtle swimming or feeding. The disease is tied to a herpesvirus and turns up more often where coastal waters are degraded.
Q 23What special feature of a green sea turtle's beak helps it shear through tough plants and algae?
Serrated edges
Hatchlings crawl toward lights
Hatchlings crawl toward lights because instinct tells them the brightest horizon is the open sea. A lit-up seafront pulls them inland, and can also put off females coming ashore to nest.
Q 14Which party decorations does NOAA ask people never to release, because green sea turtles can swallow the remains?
Balloons
Balloons drift out to sea, where a turtle can take the limp scraps for food or get tangled in the strings. Discarded fishing line and plastic bags cause the same trouble.
Q 15Which invisible guide do green sea turtles sense to hold a course across thousands of miles of open ocean?
Earth's magnetic field
Earth's magnetic field works like a built-in compass for a migrating turtle. Tiny magnetic crystals in the brain are thought to let it read the field's strength.
Q 16What do Hawaiians call the green sea turtle, an animal seen there as a sign of good luck and long life?
Honu
Honu appear in old Hawaiian rock carvings, including one in the Puʻu Loa lava fields. In some legends they guided the first Polynesian voyagers to the islands.
Q 17Which hard-shelled hitchhikers glue themselves to a green sea turtle's shell and slow it down with extra drag?
Barnacles
Barnacles settle on the shell and ride along for free. Among the corals, small fish nibble growth off the shell and flippers, which cuts drag and helps the turtle swim.
Q 18From 1761 to 1825, green sea turtle soup was never missing from the Lord Mayor's Day banquet in which city?
London
London made the soup a badge of civic luxury. At one tavern dinner there in 1808, 400 men got through 2,500 pounds of turtle in a single sitting.
Q 19Which Caribbean territory, named Las Tortugas by Columbus, puts a green sea turtle on top of its coat of arms?
Cayman Islands
Cayman Islands waters once teemed with turtles, which drew passing ships in search of fresh meat. The national airline's mascot is a cartoon turtle called Sir Turtle.
Q 20Tortuguero, the beach where most of the Caribbean's green sea turtles hatch, is a national park in which country?
Costa Rica
Costa Rica has limited egg collecting at Tortuguero since the 1950s. The park was set up in the 1970s partly to guard the nesting beach.
Serrated edges line the beak like a saw, with the stronger notches on the lower jaw. Its close relative the hawksbill has a hooked beak instead.
Q 24What happens to a green sea turtle's sharp underwater eyesight when it hauls itself out onto land?
It turns nearsighted
It turns nearsighted in air, because the round lenses of its eyes are tuned to bending light underwater. In the sea it sees color well, though little at the red end of the spectrum.
Q 25In 2025, after decades of protection, the IUCN moved the green sea turtle from Endangered to which Red List category?
Least Concern
Least Concern became the species' global status after it had been listed as Endangered since 1982. Numbers have risen by about 28% since the 1970s, though some regional populations are still at risk.
Q 26Which Indonesian island, known for green sea turtle feasts at ceremonies, has imported turtles since the 1950s?
Bali
Bali ran through its own turtles and began bringing them in from the far corners of the archipelago. Indonesia restricted the trade in 1999 as numbers fell.
Q 27Young green sea turtles drifting far from shore find food and shelter in floating mats of which brown seaweed?
Sargassum
Sargassum rafts shelter small turtles through their hidden first years at sea. The drifting weed gives them food, cover and a ride on the currents.
Q 28Which fishing boats must fit turtle excluder devices, escape hatches that let a netted green sea turtle swim free?
Shrimp trawlers
Shrimp trawlers tow nets in which a trapped turtle soon drowns. Since 1989 the United States has refused shrimp from countries whose fleets do not protect turtles the same way.
Q 29What do rescuers call the helpless floating state that grips green sea turtles when water drops to about 50°F?
Cold-stunning
Cold-stunning leaves a turtle too sluggish to swim, so it bobs at the surface and can drown. Thousands of stunned turtles were rescued in Texas during one winter storm in 2021.
Q 30With no outer ears and a single ear bone, a green sea turtle can pick up only which kind of noise?
Low-frequency sounds
Low-frequency sounds are what it hears, with its ear keenest at a few hundred hertz. It also picks up vibrations through its skull, backbone and shell.