fipronil

A UK study warns that chemicals fipronil and imidacloprid used in pet flea treatments are harming wildlife in rivers, parks, and conservation areas, despite being banned as pesticides. These toxic chemicals are causing irreversible damage to aquatic life, birds, and pollinators, and have also been linked to lower cognitive scores in children with autism. The study calls for urgent government action to restrict their use.

Experts urge restrictions on pet flea treatments after research found common UK garden birds' feathers widely contaminated with insecticides linked to brain damage and chick mortality. Permethrin, imidacloprid, and fipronil—banned for agricultural use but present in pet treatments—were detected in nearly all tested samples.