UC Berkeley Study Detects Ethanol in 26 of 29 Flower Species, Putting Hummingbirds Near 1 Drink Equivalent
Updated
Updated · SciTechDaily · May 25
UC Berkeley Study Detects Ethanol in 26 of 29 Flower Species, Putting Hummingbirds Near 1 Drink Equivalent
3 articles · Updated · SciTechDaily · May 25
26 of 29 plant species sampled contained ethanol in at least one nectar sample, giving the first large-scale evidence that floral alcohol is widespread.
0.056% by weight was the highest nectar concentration measured, likely produced when yeast fermented nectar sugars; most samples contained only trace amounts.
Anna’s hummingbirds may ingest about 0.2 grams of ethanol per kilogram daily because nectar makes up 50% to 150% of their body weight intake—roughly a human equivalent of one alcoholic drink.
1% alcohol in sugar water was still readily consumed in earlier feeder tests, while visits fell by about half at 2%, suggesting hummingbirds tolerate low levels but limit higher intake.
Researchers said the birds appear unlikely to become intoxicated, but chronic low-dose exposure could still shape foraging behavior and points to broader animal adaptations to dietary ethanol.
Hummingbirds tolerate a daily 'drink' without harm. Could their biology unlock new treatments for human alcohol addiction?
If hummingbirds drink alcohol daily, could this natural exposure offer them a hidden evolutionary advantage?