Hen harriers are functionally extinct as a breeding bird in England due to illegal persecution linked to driven grouse shooting.
Hen harriers face welfare harm from illegal persecution including shooting, trapping, and nest destruction. Brood management which moves chicks to aviaries creates welfare costs during captivity and release. Birds may also face secondary poisoning from medicated grouse grit and rodenticides used on moors. Harassment during the breeding season can prevent successful nesting.