BIRDS are lining their nests with cigarette butts to repel pests and keep themselves warm, according to research.

Wild birds have long protected their nests from mite invasion by importing chemical-emitting plants, reports the Daily Telegraph. But now birds living in cities seem to have adapted similar behaviour, filling their nests with up to 48 cigarette buts to make use of the repellent properties of tobacco.

The nicotine and other chemicals in discarded filters act as a natural pesticide that repels parasitic mites.                  –MO