New research, funded by SongBird Survival and published today by the University of Sussex, has found these pesticides - fipronil and imidacloprid, ingredients in products such as Frontline and Advocate - in bird feathers, eggs and chicks. One study found them both in the feathers of five common garden songbirds: blackbirds, blue tits, chaffinches, dunnocks and goldfinches. The second study revealed the pesticides can transfer from contaminated fur-lined nests, sadly being found in dead chicks and unhatched eggs.