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Seeds can be a great treat but only in small amounts as birds prefer seeds and can quickly start to refuse the better foods, so don't set yourself up for problems. NEVER use wild bird seed, they are grown and packaged under different guidelines than pet bird seed so tend to have much higher levels of pesticides, they also have higher levels of other contaminants and are less likely to be fresh. The nutrients in seeds fades as it ages, so even if you insist on feeding seed make sure it is fresh and doesn't contain insects like meal moths. There have been some questions raised about broccoli and onions so be careful.
Meats that are old or even slightly undercooked. Although some meat, especially poultry, like chicken, is good for birds be very careful. Also make sure you stay away from your birds if you have any fresh poultry juices on your hands, keep your birds away from counters that you've used for preparing poultry and other fresh meats. It has been said that much of the bacteria and viruses carried by fresh poultry is destroyed if frozen. I only purchase frozen chicken, this is also protection for the rest of my family.
The outside of fruits and vegetables; I pare down all of these to the bare flesh due to the difficulty of removing pesticides and other chemicals. I even peel grapes and pare down strawberries, I then rinse them some more. This is very important, one unwashed piece of strawberry can kill even a large bird, it has happened!!
All seeds and pits; Apple and some other fruit seeds contain deadly poisons, though in small amounts. Some pits like peach pits are also toxic. To be safe never allow your bird to have any of these. Strawberry and raspberry seeds are ok but again, you want to pare these down anyway.
House plants are next on my list. Never let your bird near your plants unless you are positive they are safe, of course even if they are safe for your bird your bird is not safe for them! It is difficult to determine the toxcicity of plants so be careful!
Teflon and all non-stick coatings are hazerdous if over-heated. They produce toxic gasses that WILL kill your birds. People have lost whole housefulls of birds, and this is not rare, it's happened over and over!! Teflon can be found on frying pans, stove drip pans, broiler pans, cookie sheets, etc. so to be safe keep these out of your home!! Feeding your birds food that has been cooked on teflon is probably safe, as long as there is no scratches or flaking of the teflon. Something to think about; If teflon gasses kill birds, and FAST, what may they be doing to your family?
Lead is another frequent hazard. It can be found in house paints, art paints and products, stained or leaded windows, even in bird toys! Some small bird toys are made in other countries and can contain lead weights or paints. I give my Cockatoos infant toys like plastic keys. I also buy bird toys from reputable companies that are based in this country. There are many hidden sources of lead; I read where a woman lost her bird after it chewed on a pull cord from a lamp that contained lead. BE CAREFUL!!
Wood can be toxic. Some woods are naturally toxic, some have been treated or stained with toxic chemicals. If you want to give your bird natural perches or chews make sure they are safe. Apple and manzanita are safe woods. You can purchase manzanita from pet stores. I look for old apple trees to use for my birds but I make ABSOLUTELY sure they have not been sprayed with pesticides. Also choose trees that are away from roads, automobile exhausts can build up in the soil and poison the wood.
Any air-borne chemicals like spray disinfectants and air fresheners can do serious harm to your bird's lungs. To be safe never spray ANYTHING into the air near your birds. Start reading your household product warnings, you'll do your family a favor if you stay away from any chemicals that mix with the air. Use liquid cleaners that mix with water rather than spray cleaners. Cigarette smoke falls in this catagory, it can cause the same problems in birds as in humans, only much quicker! REMEMBER, anything that comes in either aerosol or pump spray can be toxic to your birds and is probably not a healthy addition to your lungs either!
Fumes like bleach are also a problem. If you can smell it your birds shouldn't! Even a self-cleaning oven can prove dangerous.
Once again; Birds have a much higher metabolism than humans, a tiny bit for you is a huge dose to them. When you wash their dishes, your hands etc., rinse everything VERY thoroughly to remove all traces of soap, even rinse dishes out of your dishwasher. Whether or not your birds don't show symptoms immediately you are still greatly increasing their chances for disease and cancer later in their life. Protect your bird AND your family!