The Montagu harrier is the rarest breeding harrier in Britain, nesting in arable crops where it faces destruction by farm machinery, requiring intensive conservation management to maintain even a tiny breeding population.
Montagu harrier welfare in the UK depends almost entirely on farmer cooperation to protect nests from combine harvester destruction. Without the voluntary protection scheme, the UK breeding population would likely be eliminated within years. Legal protection is insufficient without practical on-the-ground management. Pairs that do breed successfully face elevated predation risk from foxes at ground nests. International conservation is needed to protect birds on the African wintering grounds.