Hen harriers are persecuted on grouse moors because they prey on red grouse. This illegal killing has kept the English population critically low despite decades of legal protection.
Hen harrier persecution involves the deliberate killing of individual birds through trapping, shooting, and poisoning. Poisoned birds experience prolonged neurological symptoms before death. Trapped birds may suffer for extended periods before collection. Beyond individual welfare, the population-level impact - keeping a species from recovering in available habitat - represents a sustained structural harm maintained by illegal killing at scale. The complicity of some sporting estates in this persecution makes it a wildlife crime with severe welfare consequences. Legal protection is meaningless without enforcement.