Why City Birds Love Cigarettes

From SciShow.

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Urban birds like house finches and house sparrows are great at finding materials to repel pests and parasites from their nests. Unfortunately, one of those materials is used cigarette butts.

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Sources: https://docs.google.com/document/u/1/d/e/2PACX-1vSaPesLANMFHBELGRlYJPPzYKfjs1-kRVNb3-bXVEriJzZCaCwJQIWjCjhIuU1Ks3IqEpfq2BJaA4CA/pub