Birds are exquisitely sensitive to toxins, especially those in the air they breathe. Cleaners, such as those used to degrease ovens, produce dangerous airborne contaminants and can be fatal to birds. Even strong cooking odors and smoke is a risk. Non-stick cookware is another worry. When overheated, the fumes can kill birds.
Birds can drown in small amounts of water.
The toilet bowl, uncovered, has been the source of many avian injuries. Birds do like water play, and with supervision, many even enjoy showers with their owners. Bath perfumes and hair spray must be avoided around birds. Chewing is the next big concern with birds. Most birds chew anything they can get their beaks on.