Birds Appear to 'Self-Medicate' With Our Cigarette Butts

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Incorporating nicotine into their nests keeps parasites out. Nature is training flying urban Roombas.

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We never actually established why birds suddenly appear every time you are near. It might just be because you are one of the terrible, horrible people who throws cigarette butts on the ground everywhere. When a little bird waddles out and picks one up and uses it to build a nest, though, you are sort of redeemed, in that the world becomes a better place for its bird family. 

Research published today in the journal Biology Letters followed urban birds and measured the amount of cellulose acetate (from cigarette filters) in their nests. The nests with more butts had fewer parasites.

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[Suarez-Rodriguez, et al. Biology Letters]


We've known for a while that nicotine is an arthropod repellant. (Are smokers less susceptible to ear mites?) And while we know that birds historically bring certain plants into their nests that will clear our parasites, the biologists are not clear on whether the birds are knowingly employing this effect with the cigarettes. They write, "Urbanization changes the abundance and type of resources upon which birds depend ... Potential changes in host-parasite interactions as a consequence of urbanization may thus influence which species are most able to exploit urban landscapes."

I've said it before and I'll say it again: The birds are in control. If researchers can prove that birds are doing this purposely, it would be what they call zoological "self-medication" -- just like what we do with cigarettes, except they're medicating themselves against infectious parasites instead of existential fear that they may be incapable of love. Or being loved. That's why we smoke, right?


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James Hamblin, MD, is a senior editor at The Atlantic.

 
 
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