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Hedgehogs are primarily insectivores, but will also taste other things like fruits, veggies, eggs, and meat. They tend towards plumpness, so care must be taken with the diet to prevent a hedgehog from putting on too much weight. An overweight hedgehog cannot roll up and may have "bags" of fat hanging down, which will impede its walking ability. While a hedgehog's exact nutritional needs are somewhat mysterious, high-quality cat kibble is considered a good choice for a staple diet, which should be supplemented with other various foods, discussed below. The kibble you choose should be below 15% fat and around 32-35% protein; look for foods that are organic or holistic - avoid kibble that has by-products, corn and similar things listed. Provide about 1-2 tbsp of the dry cat food every day. Avoid low-quality hedgehog foods as they tend to have a lot of poor quality ingredients. Higher-quality foods may be acceptable, such as L'Avian, Old Mill, and 8-in-1. Many owners free-feed their hogs, giving just enough food for there to be some leftover. Supplement the kibble diet with a small amount of other food - just 1 tsp every day or every other day. Some ideas:  Cooked, unseasoned, skinless chicken, turkey, or salmon, chopped up Small bites of fruits and veggies, such as watermelon, cooked mashed peas or sweet potatoes, or applesauce  Scrambled or hard boiled & chopped egg Mealworms, crickets and wax worms: These are also an important treat to the hedgehog's diet. As insectivores, they need mental stimulation that eating live prey provides, in addition to vital nutrition. Feed a few insects one to four times a week. Never feed your hedgie wild-caught insects (e.g., ones you catch in your yard), as they may have toxic pesticides in their systems, or parasites that will infect your hedgehog. While hedgehogs appreciate a wide variety of foods, there are some things you should never feed him: nuts/seeds, dried fruits, raw meat, hard uncooked vegetables, sticky/stringy/hard foods, avocado, grapes or raisins, milk or dairy products, alcohol, bread, celery, onion and onion powder, raw carrots, tomatoes, junk food (chips, candy, anything sugary, salty, etc.), anything very acidic, or honey. Reduce the amount of food you're giving your hedgehog if you notice she's getting a little plump, and increase exercise. Hedgehogs have a crepuscular nature, so they are active around twilight. If possible, feed them once a day around this time. The bowl should be wide enough for the hedgehog to access and heavy enough so that the hedgehog cannot tip it over (and start playing with it). Fresh water should be available at all times.  If using a bowl, make sure it is heavy and shallow enough not to tip over. Wash it thoroughly every day and fill with fresh water. If using a bottle with a drinking tube, make certain your pet knows how to drink from it! It should have learned this from its mother, but it may need to be shown. Note that water in bottles also needs to be changed daily to prevent bacteria build-up.
Feed your hedgehog a varied diet. Choose a quality diet. Leave kibble out if you are unavailable at mealtime. Feed a variety of treats to avoid nutritional deficiencies. Know what foods to avoid. Adjust food amounts if your hedgehog gains weight. Feed in the early evening. Provide a proper food bowl. Provide a water bottle with a drinking tube or a water bowl.