Berkeley News reports
You may not realize it, but that backyard hummingbird feeder filled with sugar water is a natural experiment in fermentation — yeast settle in and turn some of the sugar into alcohol.
The same is true of nectar-filled flowers, which are an ideal gathering place for yeast — a type of fungus — and for bacteria that metabolize sugar and produce ethanol.
Read more at Do hummingbirds drink alcohol? More often than you think.
Natural History Wanderings 
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