Bitterns were extinct in Britain by 1886 and have recovered from fewer than 20 males to over 200 through targeted reedbed restoration. Their story shows what habitat-focused conservation can achieve.
Bittern welfare is closely tied to reedbed habitat quality and fish availability. During harsh winters, bitterns move to open water where they are more visible and vulnerable to disturbance and predation. Fish stocked in reedbed channels provide reliable food resources that reduce winter mortality. The dramatic population recovery demonstrates that habitat restoration directly translates to improved welfare at the population level -- animals with access to suitable habitat express natural behaviours and achieve reproductive success. This is welfare improvement through habitat, not through direct intervention with individual animals.