What turtles eat depends entirely on the species and where they live. Pet aquatic turtles like red-eared sliders are omnivores that need a mix of protein and vegetables. Box turtles split their diet roughly 50/50 between plant and animal matter. Wild sea turtles range from strict herbivores to jellyfish specialists. If you’re feeding a pet turtle or just curious about turtle diets in the wild, here’s what each type actually eats.
What Aquatic Pet Turtles Eat
Most common pet turtles, including red-eared sliders, painted turtles, and pond turtles, are omnivores. Their diet should combine commercial turtle pellets, live prey, and fresh vegetables. Pellets form the nutritional backbone because they’re formulated with the right balance of protein, calcium, and vitamins. Reliable brands include Fluker’s, Mazuri, Zoo Med, and Tetra ReptoMin.
For protein beyond pellets, you can offer feeder fish like goldfish, guppies, or minnows (sized appropriately for your turtle). Earthworms, crickets, mealworms, wax worms, snails, slugs, and grasshoppers all provide good nutrition. Even tadpoles and small frogs are fair game for larger turtles. Avoid oily fish like mackerel and smelt, since their high fat content can cause vitamin E deficiencies over time. Raw meat, fish, or chicken from the grocery store is also a poor choice because it lacks the calcium-to-phosphorus balance turtles need.
On the plant side, dark leafy greens are the priority: romaine lettuce, collard greens, mustard greens, dandelion greens, kale, parsley, endive, Swiss chard, and turnip greens. Shredded red bell pepper works well too, since many aquatic turtles are naturally attracted to the color red, and it’s rich in vitamin A. You can also place non-toxic aquatic plants like water hyacinth, duckweed, water lilies, or Elodea directly in the tank for grazing. Skip iceberg lettuce entirely. It’s mostly water with almost no nutritional value.
What Box Turtles and Tortoises Eat
Box turtles need a diet that’s roughly 50% plant-based and 50% animal-based. Within that plant half, 80% to 90% should be vegetables and flowers, with fruit making up no more than 10% to 20%.
The vegetable list overlaps heavily with aquatic turtles: collard greens, mustard greens, beet greens, broccoli, turnip greens, bok choy, kale, parsley, Swiss chard, watercress, dandelion greens, bell peppers, green beans, and escarole. Secondary options include squash, cooked sweet potato, carrots, peas, cucumber, mushrooms, asparagus, and corn. A few greens come with caveats. Swiss chard, spinach, and beet greens contain oxalates that bind to calcium and block absorption, so feed them sparingly. Cabbage, kale, and mustard greens contain goitrogens, chemicals that can interfere with thyroid function in large amounts.
For fruit, stick to small portions: apples, pears, bananas (skin on), mango, grapes, peaches, kiwis, melons, and tomato are all safe. Figs, apricots, dates, raspberries, and strawberries are especially nutritious. Flowers like dandelions, hibiscus, nasturtiums, roses, geraniums, and carnations can be offered as treats.
The animal protein half should come from live prey like crickets and earthworms, or from commercial reptile pellets. Buy insects from a pet store or reptile breeder rather than collecting them outdoors, where they may carry fertilizer or insecticide residue that’s toxic to turtles.
What Wild Sea Turtles Eat
Each sea turtle species has evolved a specialized diet. Green sea turtles are the only primarily herbivorous sea turtle, feeding mostly on seagrasses and algae. Hawksbill turtles use their narrow, pointed beaks to reach into crevices in coral reefs and pull out sponges, their preferred food. Leatherback turtles are jellyfish specialists, with spiny structures lining their mouth and esophagus that help trap slippery prey. Loggerheads are carnivores that feed on bottom-dwelling invertebrates like whelks, other mollusks, horseshoe crabs, and various crab species, only occasionally eating plant material.
Foods That Are Dangerous for Turtles
A few foods should never go in a turtle’s enclosure. Avocado and rhubarb top the list of genuinely harmful items. Iceberg lettuce and celery aren’t toxic but are nutritionally empty, essentially filling your turtle up on water and fiber without delivering any real vitamins or minerals.
The bigger nutritional threat is an imbalanced calcium-to-phosphorus ratio. Turtles need more calcium than phosphorus in their diet. When that ratio flips, calcium can’t be properly absorbed, and over time this leads to metabolic bone disease, a painful condition where the shell softens and bones weaken. This is exactly why grocery store meat is a bad staple food. It’s high in phosphorus and low in calcium. Commercial pellets, dark leafy greens, and calcium-rich fruits like figs help keep the ratio where it should be.
How Age Changes a Turtle’s Diet
Young turtles need significantly more protein than adults. Juvenile turtles are growing rapidly, and their bodies demand a protein-heavy diet to support that growth. Research on juvenile green sea turtles found that optimal growth occurred at about 40% dietary protein. As turtles mature, they gradually shift toward more plant matter and less animal protein, particularly in omnivorous species like red-eared sliders that become increasingly herbivorous with age.
Feeding frequency also changes with age. Juvenile turtles should eat once or twice a day, while adults only need to be fed once every day or two. The exact schedule varies by species, but the pattern is consistent: younger turtles eat more often and need more protein per meal.
What Animals Eat Turtles
If you landed here wondering what preys on turtles, the answer depends on the turtle’s life stage. Eggs and hatchlings are the most vulnerable. Raccoons, coyotes, armadillos, feral hogs, and unleashed dogs all raid turtle nests on beaches and in forests. These are natural predators in some cases, but human changes to the environment have dramatically increased nest predation on many beaches, pushing it to unnatural levels.
Adult turtles have fewer predators thanks to their shells, but they’re not immune. Large alligators and crocodiles can crush turtle shells. Birds of prey, including some eagles, will carry smaller turtles into the air and drop them onto rocks. Sharks occasionally prey on sea turtles in the open ocean. For freshwater turtles, raccoons, foxes, and large fish like bass or pike will take smaller individuals when the opportunity arises.