The Yellow-bellied Slider is the nominal subspecies of the "sliders" called Terrapins in Europe and Turtles in their native USA. Like the more well-known subspecies, the Red-eared Slider (which also has a yellow belly), the Yellow-bellied Slider is a freshwater, semi-terrestrial/semi-aquatic chelonian, with dual-purpose clawed feet/flippers.
The Yellow-bellied Slider has a yellow band rising to behind its light yellow-green eye and has no red marks on its head at all.
Above left is a mixed group of two Red-eared Sliders with a Yellow-bellied Slider on top. Above right is a Yellow-bellied Slider.
The Yellow-bellied Slider is also feral in the UK, but less prevalent than its Red-eared cousin.
Neither terrapin can breed in the UK cold climate.
Is this a simple Yellow-bellied or a hybrid with the Red-eared Slider?
As a terrapin, it is at home in the water and on land.