Finken verbauen Kippen und die Fasern in den Filtern in ihre Nester, um sie mit den darin enthaltenen Chemikalien gegen Parasiten und Zecken abzusichern. Finken scheinen mir ein bisschen smarter zu sein, als Heroin-Tauben.
Constantino Macías Garcia at the National Autonomous University of Mexico, and his colleagues, have spent several years studying the curious cigarette habit in urban house finches (Carpodacus mexicanus). Initial evidence hinted that nicotine and other chemicals in the butts might help deter insect pests from moving into the nests – nicotine does have anti-parasite properties – but it wasn’t conclusive.
To firm up the conclusion, Macías Garcia and his team experimented with 32 house finch nests. One day after the eggs in the nest had hatched, the researchers removed the natural nest lining and replaced it with artificial felt, to remove any parasites that might have moved in during brooding. They then added live ticks to 10 of the nests, dead ticks to another 10 and left 12 free of ticks.
They found that the adult finches were significantly more likely to add cigarette butt fibres to the nest if it contained ticks. What’s more, the weight of cigarette butt material added to nests containing live ticks was, on average, 40 per cent greater than the weight of cigarette butt material added to nests containing dead ticks.
The results suggest that the finches are using the cigarette butts to “medicate” their nests against the ticks, says Macías Garcia.