"Bird species around the world, including house sparrows and song thrushes, have been observed collecting cigarette butts for their nests, potentially to repel pests that threaten their young."
"The chemical attributes of tobacco and commercial cigarettes may have a repellant effect on insects, providing a protective benefit to birds nesting in vulnerable spaces."
"A new study of blue tits in Europe provides quantified evidence that the presence of cigarette butts in the nest environment could deter pests like ticks and fleas."
Numerous bird species globally, including Darwin's finches and blue tits, collect discarded cigarette butts for their nests. This behavior may provide a pest-repelling effect, protecting eggs and chicks from harmful insects. Researchers have observed this phenomenon in various locations, suggesting that the chemical properties of cigarette butts could outweigh their toxicity. A study on blue tits indicates that these birds, which nest in enclosed spaces, may use cigarette butts to deter pests like ticks and fleas that threaten their young.
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