Sunning and stretching

I’m told this is an invasive Red-eared Slider, based on the red patch on the head, and what looks like a bright yellow underbelly

   8 October 2023
   Lost Lagoon
   1/1250s    f/9   187mm   ISO 2000
A Turtle, dark grey with a red slash on the side of the head, is lying on a rock with its back legs stretched out and head raised high