I am an Eagle Scout and the creator of B&H's Turtle Site, a website about turtles.
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Painted Turtles and Red Ears cannot mate together they are to distantly related to produce offspring. However the two turtles are very similar down to their tendencies and mating rituals. Some turtles can cross breed and create hybrid turtles but you are much more likely to have cross breeding between subspecies instead of species, as in this case Red Ear Slider and Yellow Bellied Slider. In Painted Turtles it would be mating between Eastern, Southern, Western and Midland subspecies. You can find other hybrids like a Ouachita Map Turtle and Red Ear Slider hybrid around for sale sometimes but I think they may be infertile if I remember correctly.