Pine martens were nearly extirpated from Britain but are recovering through protected areas and reintroduction programs. Their predation on invasive grey squirrels benefits native red squirrels, creating conservation synergies.
Pine marten welfare is primarily affected by habitat loss and illegal persecution. Individuals caught in snares or traps set illegally face injury and death. The recovery of pine martens in Scotland and the subsequent cascade effects on squirrel populations demonstrate that single-species conservation can have multiple-species welfare benefits. Red squirrels, whose welfare had been compromised by competitive exclusion from grey squirrels, have benefited from pine marten recovery. The welfare of translocated pine martens during the reintroduction process requires careful protocol including health screening, appropriate holding conditions, soft-release designs, and post-release monitoring. Successful translocations demonstrate that appropriate welfare management can achieve conservation outcomes.