Northern wheatears are long-distance migratory birds undertaking extraordinary journeys from Alaska and Arctic Canada to sub-Saharan Africa. Their welfare along this route depends on suitable stopover habitats and freedom from hunting pressure.
Wheatear welfare during migration represents the welfare challenges of long-distance migrants more broadly. The Sahara crossing requires birds to accumulate sufficient pre-migratory fat reserves to sustain a 1,500+ kilometre non-stop flight without feeding. Stopover habitats before the crossing - in the Sahel region and North Africa - provide the refuelling opportunities essential for flight completion. Degradation of these habitats through desertification, agricultural intensification, and drought reduces refuelling quality and forces birds to attempt the crossing with insufficient reserves. Individual birds that exhaust their fat reserves during the Sahara crossing die without immediate access to land. Spring migration faces similar challenges, with birds arriving on UK breeding grounds in very lean condition after a northward journey from Africa. Breeding habitat quality in the UK determines whether arriving birds can rapidly regain condition.