The marsh harrier recovered from near-extinction in Britain (just one nesting female in 1971) to over 600 pairs today. Its welfare success demonstrates what protective legislation and habitat management can achieve.
Marsh harrier welfare is tied to reedbed management and freedom from persecution. Modern reedbed conservation — at RSPB reserves including Minsmere, Titchwell and Strumpshaw Fen — has created extensive protected breeding habitat. Winter welfare depends on continued vole and frog availability in reedbed margins. Illegal persecution, while less common than for other raptors, still occurs at some sites where harriers are viewed as threats to gamebird production. The species' recovery from a single female to 600+ pairs in 50 years demonstrates the extraordinary population-level welfare benefits of targeted protection and habitat restoration.