The bittern's distinctive booming call is one of Britain's most evocative wildlife sounds. Booming males defend large reed bed territories and require undisturbed, fish-rich wetlands for successful breeding.
Individual booming bitterns in cold winters face acute welfare challenges when frozen channels prevent access to fish prey. Reserve managers in some areas have kept channels ice-free during cold snaps to prevent starvation. The remarkable population recovery demonstrates that sustained habitat investment translates directly into welfare benefits for hundreds of individual birds.