I found this little Yellow-bellied Slider (Trachemys scripta scripta) hatchling, maybe two inches round, resting in my mulch last weekend. As one of the pond sliders it will spend much of its adult life in the water. Juveniles, however, stay near their terrestrial nest for the first six months or so.

I presume it will eventually wander across the street to the nearby canal, until then it will dine on insects in my backyard which works out well for me!