Ancient, Resilient, and Full of Surprises
Turtles are among the oldest reptiles on Earth, and after hundreds of millions of years of evolution, they've developed some truly remarkable traits. Whether you're a long-time turtle keeper or just curious about these shelled wonders, these facts are sure to deepen your appreciation for them.
1. Turtles Predate the Dinosaurs
Turtles have been around for approximately 230 million years — before most dinosaurs even appeared. The earliest known turtle, Odontochelys semitestacea, had a fully formed plastron (bottom shell) but only a partial carapace, giving scientists clues about how the shell evolved.
2. The Shell Is Part of Their Skeleton
A turtle's shell is not a house it lives inside — it is fused to the animal's spine and ribcage. The shell contains around 60 bones. You cannot remove a turtle from its shell any more than you can remove a person from their ribcage.
3. Turtles Can Feel Touch Through Their Shell
The shell is packed with nerve endings, meaning turtles can feel pressure and touch through it. When you gently tap or stroke a turtle's shell, they can actually sense it.
4. Some Turtles Breathe Through Their Backsides
During winter, some freshwater turtles like the painted turtle absorb oxygen through a process called cloacal bursae — essentially "breathing" through specialized tissue near their cloaca. This allows them to survive under ice for months without surfacing.
5. Tortoises Can Live Over 100 Years
The Aldabra giant tortoise and the Galápagos tortoise are among the longest-lived vertebrates on Earth. Some documented individuals have lived well past 150 years. Even common pet tortoises like Sulcatas can live 70–100 years.
6. Sea Turtles Navigate Using Earth's Magnetic Field
Sea turtles have a remarkable built-in compass. They can detect variations in Earth's magnetic field and use them to navigate across thousands of miles of open ocean, returning to the exact beach where they were born to lay their own eggs.
7. Temperature Determines the Sex of Hatchlings
For many turtle species, it's not genetics but nest temperature that determines whether an egg develops into a male or female. Warmer temperatures tend to produce females; cooler temperatures produce males. This is called temperature-dependent sex determination.
8. Turtles Don't Have Teeth
Turtles use sharp, hard beaks to bite and tear food. Different species have different beak shapes suited to their diets — carnivorous species have sharp, pointed beaks, while herbivorous tortoises have serrated ridges for tearing vegetation.
9. A Group of Turtles Has a Unique Name
A group of turtles is called a bale (sometimes also a "dule" or "nest"). Whether in the wild or basking together in a pond, a bale of turtles piled on a log is one of nature's most peaceful sights.
10. Turtles Existed Alongside T. rex
While many species were wiped out in the mass extinction event 66 million years ago, turtles survived. Their ability to withstand starvation, breathe with minimal oxygen, and endure harsh conditions likely played a role in their survival.
11. Tortoises Are Always Turtles — But Not All Turtles Are Tortoises
"Turtle" is the broad category that includes all shelled reptiles of the order Testudines. "Tortoise" refers specifically to fully terrestrial, land-dwelling members of the family Testudinidae. All tortoises are turtles, but aquatic and semi-aquatic turtles are not tortoises.
12. Some Turtles Can Change Colors
While not as dramatic as a chameleon, some turtle species show seasonal or age-related color changes. Male Red-Eared Sliders, for example, can darken dramatically with age — a process called melanosis.
13. Turtles Communicate More Than You'd Think
For a long time, turtles were thought to be largely silent. Research has since revealed that many species produce low-frequency sounds — particularly during mating season or to communicate with hatchlings. River turtles have even been observed guiding their young with vocalizations.
14. The Leatherback Sea Turtle Is the Largest Turtle Alive
The leatherback (Dermochelys coriacea) can exceed 7 feet in length and weigh over 2,000 pounds. Unlike other turtles, it has a rubbery, leather-like shell rather than a hard bony carapace, and it dives deeper than any other reptile.
15. Turtles Have Been in Space
In 1968, Soviet spacecraft Zond 5 carried steppe tortoises on a mission that looped around the Moon. The tortoises survived and returned to Earth, making them among the first animals to travel to the Moon and back.
The Wonder of Turtles
From their ancient lineage to their remarkable biology, turtles continue to surprise even experienced researchers and keepers. Whether you share your home with one or simply admire them from afar, there's no denying that turtles are truly extraordinary animals.