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Check the bird's cage for stressors. Add lots of entertainment. Provide plenty of social interaction. Move shyer birds away from noisy ones. Take your bird to the veterinarian if you notice changes in behavior.

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Make sure you are cleaning the bird's food and water dishes every day and changing the lining once a day as well. Do a full cleaning at least once a month. Also, ensure the bird has places where it can hide from perceived threats, which will make it feel safer.  Perch tents, for instance, offer a place for your pet to hide away. Ensure the cage is big enough for your bird. In fact, you can't have a cage that's too big. Look at normal recommendations and double them for a truly happy bird. What kinds of toys you add really depends on the type of bird you have, but swings, rope toys, shiny toys, and mirrors are typically popular toys. You can also offer chew toys and foraging toys. Check your local pet store for some fun options. Many birds also like soft, cuddly toys or ones they can hide in, such as snuggle rings or tents for a perch. Keep your bird's cage in a room that gets a lot of traffic. Your bird wants to be around its flock, and its flock is you and other people in the house, particularly if it's the only bird around. Also, be sure to let it out of its cage when you can so that it has a chance to socialize with you even more.  Put perches in various rooms in the house so it can come visit when it's out of the cage. Make it a point to visit with and talk to your bird if it seems to be stressed or bored. Some birds, like parakeets, enjoy getting noisy with their flocks. Other birds, such as canaries, think that constant bird sounds mean there's a threat around, and these birds can be stressed out by the ones who enjoy making noise. Try to house them in separate rooms if you have breeds from each of these categories. That way, the shyer birds won't be stressed all the time. If your bird becomes quieter or lethargic, that could be a sign of sickness. If it is sick, it may sleep a lot or have ruffled or dirty-looking feathers, and you may notice other symptoms.  Other symptoms may include diarrhea, bloody feces, vomiting, weight loss, sneezing, bad posture, crusty nose or feet, puffing up feathers all the time, moving its tail while trying to breathe, sleepy-looking eyes, and bad/atypical posture. If your bird is sick, it may need medication, such as antibiotics.