Common Slider (Trachemys scripta)
This turtle was basking in the sun in a man made pond in Castelldefels, Barcelona, Spain. Red-eared sliders like this one are not native to the area, they originate from the south-central and southeastern United States and northern Mexico., but are very common as pets. This one was likely a pet at some time, or descendant of a pet that was released into the pond. Pet turtles should never be released into the wild as they can be carriers of diseases that are not known to the native species, but could harm them.