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Canaries need a varied diet of seeds, pellets, fresh fruit, and leafy vegetables. You can usually find a special canary mix of seeds and pellets at pet stores. Give them one teaspoon of this mix a day.  Some good vegetables and fruits for the canary include kale, apples, broccoli, grapes, dandelion, oranges, bananas, peas, and melons. Attach both a cuttlefish bone and an avian mineral block to the side of the cage. Your canary will slowly eat away at these for calcium and minerals. Never feed your canary avocado as it is toxic to birds. Canaries need constant access to fresh water. Once a day, take the bowl out of the cage. Empty it out, and wash it with warm water and soap. Rinse it well and dry it with a towel before refilling with fresh water. The cage needs a full cleaning once a week. Put the canary in a bird carrier. Empty out the liner before scrubbing the entire cage with hot water and soap. Wash all of the dishes and perches too. Let everything dry before putting them back in the cage. The cage liner and dishes should be washed every day. Canaries are sensitive to the sun. They may stay awake if there is any light coming into their cage. To prevent this, place a blanket or a cover over the cage after the sun goes down. Canaries have delicate lungs, and they can be prone to mites or other parasites. Take your canary to a specialized avian veterinarian if they show any signs of sickness.  Common signs of sickness include fluffed, ruffled, or thinning feathers, inactivity, discolored feces,  discharge around the eyes or beak, or squinting. To find a local avian vet, you can use the database at the Association of Avian Vets.
Feed your canary a varied diet. Replace their water daily. Clean their cage once a week. Cover the cage at night. Watch for signs of sickness.