The willow tit is one of the UK's fastest declining resident birds, with population loss exceeding 90 percent since 1970, requiring urgent habitat management.
Willow tit welfare is critically dependent on the availability of wet woodland and scrub with rotting wood for nest excavation. Unlike other tits, willow tits cannot use pre-existing holes and must excavate fresh cavities each year in soft rotting stumps and branches. Loss of wet woodland through drainage and development eliminates this unique nesting requirement. Scrub clearance for amenity or agricultural reasons removes both nesting substrate and the invertebrate-rich habitat required for feeding. Recovery requires targeted habitat management including rewetting of carr woodland, coppicing to regenerate rotting wood, and protection of existing willow tit territories. The species sedentary nature makes local extinction extremely difficult to reverse.