Head to head
Green Sea Turtle vs Galápagos Tortoise
Both belong to the order Testudines, the shelled reptiles. "Turtle" is the whole group; "tortoise" is the subset that lives entirely on land. In British English "turtle" often means only the sea-going species, which adds to the confusion. Here is the practical breakdown, using a sea turtle and a giant tortoise.
| Green Sea Turtle | Galápagos Tortoise | |
|---|---|---|
| Where it lives | The open ocean; comes ashore only to nest | Dry land only — arid islands and grassland |
| Shell | Flat, streamlined, light for swimming | High and domed, heavy, for protection |
| Limbs | Flippers | Stumpy, columnar, elephant-like legs with claws |
| Swimming | Superb — crosses oceans | Cannot swim; sinks and drowns in deep water |
| Diet | Seagrass and algae (adults); jellyfish, sponges | Grasses, cactus, fruit, flowers — herbivore |
| Lifespan | 70+ years | 100–190 years |
| Eggs | Buried on a beach, then abandoned | Buried in soil on land, then abandoned |
| Can retract head | No | Yes, fully |
Turtle vs Tortoise: common questions
What is the difference between a turtle and a tortoise?
A tortoise is a turtle that lives exclusively on land. It has a high domed shell, thick stumpy legs, and eats plants, and it cannot swim. "Turtle" is the umbrella term for all shelled reptiles, including aquatic and semi-aquatic species with webbed feet or flippers. So every tortoise is a turtle, but a sea turtle or a pond turtle is not a tortoise.
Is a turtle or a tortoise faster?
In water, a turtle — sea turtles can swim at up to about 35 km/h. On land, both are slow, but a tortoise is generally steadier and can cover ground for longer; the "tortoise and the hare" reputation for slow persistence is fair.
Can you keep a sea turtle as a pet like a tortoise?
No. Sea turtles are protected wild animals that need the open ocean and are illegal to keep. Some small freshwater turtles and land tortoises are kept as pets, but even those are long-lived, need specialist care, and are often released irresponsibly.