Twenty plus Red-eared Sliders basking on a dead fall in Dixon Branch near Sunset Bay, White Rock Lake.
Wikipedia has this to say about the Red-eared Slider:
Red-eared sliders get their name from the small red dash around their ears. The “slider” part of their name comes from their ability to slide off rocks and logs and into the water quickly. This species was previously known as Troost’s turtle in honor of an American herpetologist; Trachemys scripta troostii is now the scientific name for another subspecies, the Cumberland slider.