Experts call for restrictions on pet flea treatments that harm UK songbirds
flea treatments.
Fipronil and imidacloprid are known to impair breeding success in garden birds and to disrupt their neurological function, the researchers said, while [permethrin has been found](https://academic.oup.com/conphys/article/8/1/coaa076/5890380?login=false) to slow the growth