The female Red-eared Slider grows to be 25-30 cm (10-12 in) in length and males 20-25 cm (8-10 in). They are almost entirely aquatic, but do leave the water to bask in the sun and lay eggs. These reptiles are deceptively fast and are also excellent swimmers. They hunt for prey and will attempt to capture it when the opportunity presents itself. They are very aware of predators and people and generally shy away from them. In fact, the Red-eared Slider frantically slides off rocks and logs when approached - hence the name.
Contrary to popular misconception, Red-eared Sliders do not have saliva, but--like most aquatic turtles--they have fixed tongues. This is the reason they must eat their food in water.
Habits and Behavior
Red-eared Sliders are omnivores and eat a variety of animal and plant materials in the wild including, but not limited to fish, crayfish, carrion, tadpoles, snails, crickets, wax worms, aquatic insects and numerous aquatic plant species. The captive diet for pet Red-eared Slider should closely match the natural diet and can also include other foods such as feeder fish, dead, thawed fuzzy mice, earthworms,small snakes , cooked egg with the crumbled shell included, hermit crab food, assorted fruits except mangos, and leafy greens. Commercial turtle foods should be used sparingly due to insufficient scientific research and vitamin and mineral imbalances.  Calcium (for shell health) can be supplemented by adding pieces of cuttlebone to the diet. Younger turtles tend to be more carnivorous (eat more animal protein) than adults do. As they grow larger and older, they become increasingly herbivorous.