The pond slider (Trachemys scripta) is a common, medium-sized semi-aquatic turtle. There are three subspecies of sliders. The most recognizable subspecies is the red-eared slider (T. s. elegans), which is popular in the pet trade and has been introduced to other parts of the world by people releasing it to the wild. Baby and juvenile pond sliders have a green shell (carapace) and yellow green skin with dark green striped markings. Markings and colors fade in adults to a muted olive green to brown carapace. Some individuals become almost black with few visible markings. The carapace is oval and flattened. The underside of the shell is yellow with dark markings in the center of each scute.