Badgers are highly social mustelids with complex clan dynamics, and management interventions that disrupt social groups cause welfare harms that persist long after the intervention.
Badger welfare is particularly sensitive to social disruption: clan fragmentation from culling or sett destruction causes dispersal of distressed individuals who carry infection further while in a stressed, immunosuppressed state. The perturbation effect of culling — well-documented in the Randomised Badger Culling Trial — demonstrates that welfare harm and public health effectiveness move in opposite directions. Vaccination, which does not disrupt social groups, is both more welfare-positive and more epidemiologically effective in the medium term.