Birds, especially older ones, have a lot of dust/fluff adhering to their wings - which gets scattered around whenever they flap their wings ! And their excreta also emit a foul odour, which attracts quite a lot of flies/germs.
Some babies [not all !] are allergic to exposure to such dust, flies and germs - any one of which can cause breathing problems. So, it is always better to be safe than sorry, isn't it ?!
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