why do city birds bring cigarette butts to their nests use for chemical warfare against ticks Urban birds using Cigarette Butts

Urban birds using Cigarette Butts in nests: A study has surprisingly found House finches and House sparrows, for example, often using cigarette butts into their nests. Studies highlighted in Nature show that Urban blue tits use discarded cigarette butts to protect their nests, study suggests The Great Nest Defence: Why Urban Birds Are Building Homes With Cigarette Butts (And It's Working!) Times Now A bird is raising it's babies in a cigarette bucket at my workplace : r mildlyinteresting

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