City birds are using cigarette butts in their nests to reduce parasites, but the toxic tradeoff may come with hidden risks ...

Research from Poland adds to evidence from Latin American countries that compounds in used cigarette butts ward off parasites ...

If you live in a city or suburb, it can be hard to feel surrounded by nature. But next time you step outside, pause, look and listen — even in the most densely populated areas, birds are almost ...