Bar-tailed godwits perform the longest non-stop migration of any bird. Understanding the welfare implications of this extraordinary feat illuminates the limits of animal endurance.
Bar-tailed godwit welfare during migration tests the boundaries of vertebrate physiology. The non-stop flight involves genuine suffering - extreme exhaustion, dehydration stress, and progressive physiological depletion. However, evolution has shaped this as the optimal strategy for survival, with birds physically reorganising their organs to fuel the crossing. The welfare question for conservationists centres on ensuring that the estuarine refuelling stops where birds recover are protected. Disturbance during the critical post-migration recovery period has disproportionate welfare consequences.