Reptiles
River Cooter
Pseudemys concinna · also called river cooters
Deep beneath the surface of a slow southern river, a male river cooter positions himself directly in front of a female and vibrates his long front claws against her face, an entire courtship conversation conducted without either turtle ever needing to break the surface for air.
Overview
The river cooter, Pseudemys concinna, is a large freshwater turtle native to rivers and other flowing wetland habitat across the southeastern and south-central United States. Its elaborate underwater courtship display, intricate shell markings, and preference for flowing water over still ponds make it one of the more behaviourally distinctive basking turtles in North America.
A courtship conducted entirely underwater
While many turtles court through visible surface behaviour, the river cooter’s entire courtship display plays out below the water, relying on touch and vibration between two fully submerged animals rather than anything a human observer at the surface would ever notice.
Status
Least Concern — widespread and stable across suitable river habitat throughout the southeastern and south-central United States.
River Cooter: common questions
How does the river cooter court underwater?
A male river cooter swims in front of a female while both are fully submerged and vibrates his unusually long front claws rapidly against her face, an elaborate courtship display performed entirely underwater rather than involving any behaviour on land or at the water's surface, a communication method that relies on touch and vibration rather than sound or visible display.
What does a river cooter eat?
Young river cooters eat a more varied diet that includes small invertebrates alongside plant material, but adults shift almost entirely to aquatic plants and algae, a dietary transition common among many basking turtle species as they mature and their digestive systems become better suited to processing plant matter efficiently.
Why do river cooters bask in large groups?
Basking helps turtles regulate body temperature and, in many species, supports shell health, and since good basking sites such as partly submerged logs or exposed rocks are often limited relative to the number of turtles wanting to use them, river cooters frequently end up basking in groups and sometimes stacking directly on top of one another to share the same favourable spot.
How can you identify a river cooter?
Look for a large freshwater turtle with a complex pattern of yellow lines and markings across an olive to brown shell, generally found basking in or near flowing rivers rather than still ponds, though distinguishing this species from several similar-looking basking turtles sharing the same range often requires close attention to the specific details of its shell pattern.