Head to head
Painted Turtle vs Red-eared Slider
In a lot of North American ponds these two are the turtles stacked up on a half-sunken log, and people mix them up constantly. Both are medium, semi-aquatic, omnivorous, sun-loving pond turtles in the same family. The painted turtle is the most widespread native turtle on the continent; the red-eared slider is a pet-trade escapee that has spread around the world.
| Painted Turtle | Red-eared Slider | |
|---|---|---|
| Shell shape | Flat, smooth, oval | More domed and textured |
| Key marking | Red and yellow along the shell edge and underside | Broad red stripe behind each eye |
| Adult size | About 10 to 18 cm | About 20 to 30 cm |
| Native range | Across the northern US and southern Canada, coast to coast | Mississippi River valley and Gulf states |
| Cold tolerance | Very high; hatchlings survive partial freezing | Lower; a warm-climate species by origin |
| In the pet trade | Sometimes kept; less common | The classic pet turtle; sold by the millions |
| As an invasive species | Not a global problem | One of the worst invasive reptiles worldwide |
| Conservation status | Least Concern | Least Concern in native range; invasive elsewhere |
Painted Turtle vs Red-eared Slider: common questions
What is the single best way to tell them apart?
The head. A red-eared slider has an obvious wide red or reddish-orange patch or stripe running back from each eye, which is where the name comes from. A painted turtle never has that; its head is marked only with thin yellow lines and it may have a yellow spot behind the eye, but not a red one. If you can see the shell, a painted turtle's is noticeably flatter, smoother, and more oval, with red and yellow decoration around the rim, while a slider's shell is higher-domed and often has more pattern on the top. When they are small the two look very similar, so the eye stripe is the reliable check.
Why is the red-eared slider such a problem outside North America?
For decades it was the cheap, widely available pet turtle sold in shops around the world, and huge numbers of them were bought small, outgrew their tanks, and were dumped in local ponds, lakes, and rivers. Sliders are hardy, adaptable, long-lived, and breed readily, and in many places they out-compete native turtles for the best basking sites and for food, and may spread disease. They are now established on every continent except Antarctica, the European Union has banned their trade and import, and they appear on lists of the world's worst invasive species. Painted turtles, being native and not heavily traded, have not caused this kind of trouble.
Can painted turtles and red-eared sliders live in the same pond?
In much of the central United States their natural ranges overlap and they do share ponds, along with other basking turtles like cooters and map turtles, sorting themselves out by subtle differences in diet and microhabitat. The concern is in places where the slider has been introduced and the painted turtle or another native is already present, because the larger, aggressive slider can monopolise basking logs, which turtles need for warmth and shell health, and push natives into poorer spots. Removing released sliders is a common local conservation task.