Galápagos turtles and tortoises: two different animals
Short answer
They are two different animals and most sources muddle them. The Galápagos giant tortoise (Chelonoidis) lives on land, weighs up to 250 kg, lives past 100 years, cannot swim, and exists nowhere else on Earth. The green sea turtle (Chelonia mydas) lives in the sea, weighs up to 150 kg, comes ashore only to nest, and is found across the tropics. You see the tortoise in the wet highlands; you see the turtle while snorkelling. Different days, different places, different trips.
On this page — 7 sections
Why everyone gets this wrong
British English keeps them apart: tortoises live on land, turtles live in water. American English often calls both "turtles". Neither habit is wrong as language — but in the Galápagos it produces a real planning error, because someone books a trip expecting to see "the turtles" and does not realise they are two separate outings on two separate days.
So this page does the boring, useful thing and separates them.
Side by side
| Giant tortoise | Green sea turtle | |
|---|---|---|
| Lives | On land. Highlands and dry lowlands | In the sea. Ashore only to nest |
| Scientific name | Chelonoidis spp. | Chelonia mydas agassizii |
| Size | Shell to 1.5 m | Shell to 1.2 m |
| Weight | Up to 250 kg | Up to 150 kg |
| Lifespan | Over 100 years, some past 150 | Estimated 60–80 years |
| Can it swim? | No. Deep water kills it | Yes — it crosses oceans |
| Found elsewhere? | Nowhere else on Earth | Across the tropics worldwide |
| Shell | High, heavy dome or saddle | Low, flat, streamlined |
| Limbs | Thick columnar legs with claws | Flippers |
| You see it | On a highland walk | While snorkelling |
The giant tortoise — the one the islands are named after
Galápago is an old Spanish word for a riding saddle. Spanish sailors used it for these animals because the shell of some populations rises at the front like a saddle horn. So the archipelago is named after the tortoise, not the other way round.
The Galápagos giant tortoise is not one animal but a group of species, each shaped by the island it lives on. Domed shells evolved on wet, highland islands where food grows low; saddle-backed shells evolved on dry, low islands where the tortoise has to stretch upward to reach cactus. That difference is one of the things Darwin was shown, and it is still the clearest visible argument for natural selection anywhere on Earth.
The number worth knowing. Whalers and settlers took an estimated 100,000 to 200,000 of them, because a tortoise survives for months in a ship's hold without food or water — fresh meat that keeps itself alive. The population fell to around 3,000 by the 1970s. It is now back to roughly 60,000. That recovery is the single strongest argument the Galápagos National Park has ever made for its own existence.
The full giant tortoise page — sites, seasons, how to tell the populations apart →
The green sea turtle — the one you meet in the water
The green turtle is the animal most visitors actually swim with in the Galápagos, and the only sea turtle that nests here. The eastern Pacific population is darker than green turtles elsewhere — dark enough that it is often called the black turtle. They graze algae in shallow bays, surface calmly a few metres from snorkellers, and are entirely indifferent to being watched.
The Galápagos population is a distinct dark-shelled variety, sometimes called the black sea turtle, and it is the only sea turtle that nests in the archipelago in numbers. Females return to the beach where they hatched, which may be decades and thousands of kilometres later, and nobody has fully explained how they find it.
The full green sea turtle page — nesting beaches, snorkel sites, conservation →
The tortoise shells are also the observation that started everything: on Floreana in 1835 the acting governor told Darwin he could name a tortoise’s island from its shell. What actually happened next →
Where you see each, island by island
| Island | Giant tortoise | Green sea turtle |
|---|---|---|
| Santa Cruz | The highlands — wild and free-roaming. The most reliable sighting in the archipelago. Plus the Darwin Station breeding centre. | Tortuga Bay lagoon and Black Turtle Cove; nesting tracks on the north-shore beaches from December. |
| Isabela | The Arnaldo Tupiza breeding centre, a walk from Puerto Villamil through the wetlands. | Concha de Perla and Los Túneles. Still, shallow, clear water — they come to you. |
| San Cristóbal | La Galapaguera, a natural-habitat enclosure a drive from town. | The Kicker Rock channel, alongside the sharks and rays. |
| Floreana | A small enclosure near the highland spring at Asilo de la Paz. | Nesting beaches on the north coast; common at Devil’s Crown. |
The practical version: one highland morning gets you the tortoises, and almost any snorkel gets you the turtles. If your itinerary has both a highland excursion and one good snorkel, you will see both.
When to come for each
- Tortoises: year-round, but they concentrate in the wet highlands during the cool season, roughly June to December. "Hundreds in one field" is a cool-season sight; the reserves are reliable all year.
- Sea turtles: in the water year-round. Nesting runs roughly December to June, with tracks in the sand from December and hatchlings emerging later in that window.
- Both at once: December to early January, or June — the overlap months.
The full month-by-month breakdown, with sea temperature →
The rules, which are not suggestions
- Two metres from any animal. No touching, no exceptions, including in the water.
- Do not block a tortoise's path. They walk where they walk. You move.
- No flash. Particularly around nesting beaches at night.
- Do not stand on a nesting beach after dark unless a guide has taken you there. Hatchlings orient by light and a phone screen sends them the wrong way.
Want an itinerary that includes both a highland tortoise morning and the snorkel sites where the sea turtles are? Tell us your dates →
Questions people also ask
Are Galápagos turtles and tortoises the same animal?
No, and they are not even close relatives in the way people assume. The Galápagos giant tortoise lives on land, cannot swim, and is the animal the islands are named after — galápago is an old Spanish word for a saddle, after the shape of some of their shells. The green sea turtle lives in the sea, comes ashore only to nest, and is found across the world’s tropical oceans.
What is the difference between a turtle and a tortoise?
In British usage, tortoises live on land and turtles live in water. American usage often calls both "turtles", which is where the confusion comes from. In the Galápagos the distinction matters practically: they live in different places, you see them on different days, and one of them will drown if it goes in the sea.
Can Galápagos giant tortoises swim?
No. They can float and they can cross shallow water, but they are land animals and deep water kills them. Their ancestors are believed to have drifted to the archipelago from South America on rafts of vegetation — an accident, not a swim.
Where can you see giant tortoises in the Galápagos?
Wild and free-roaming in the Santa Cruz highlands, which is the most reliable sighting in the archipelago and does not need a boat. Also in breeding centres on Santa Cruz, San Cristóbal and Isabela, where you see hatchlings and juveniles being raised.
Where can you see sea turtles in the Galápagos?
In the water almost everywhere you snorkel. The most reliable places are Concha de Perla and Los Túneles on Isabela, Tortuga Bay and Black Turtle Cove on Santa Cruz, and the Kicker Rock channel off San Cristóbal.
How old do Galápagos tortoises get?
Over a hundred years in the wild, and several well-documented individuals have passed 150. They are among the longest-lived vertebrates on Earth. Green sea turtles are estimated at 60 to 80 years — long, but a different order of magnitude.
How many giant tortoises are left in the Galápagos?
Somewhere around 60,000 across the archipelago today, up from a low of roughly 3,000 in the 1970s — one of the most successful large-animal recoveries anywhere. Whalers and settlers had taken an estimated 100,000 to 200,000 as fresh meat, because a tortoise stays alive in a ship’s hold for months.
Can you touch the tortoises?
No. The park rule is a two-metre distance from any animal, and it is enforced. It is not about the animal being fragile — it is about not habituating wild animals to people. Guides will tell you to step back, and they are right to.
Sources
Every figure on this page comes from one of these. If one of them changes and we have not caught up, tell us and we will fix it the same day.
- Galápagos National Park Directorate — The authority for the breeding programme and the visitor rules.
- Galápagos Conservation Trust — Population figures and the recovery record.
- Ecuador Ministry of Tourism — service portal — Ecuador’s register of licensed operators.
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