Barn swallows undertake one of the most demanding migrations of any British bird, flying 6,000 miles to sub-Saharan Africa and back. Threats along this route create welfare and conservation challenges.
Barn swallow welfare challenges extend across three continents. In the UK, reduced insect availability means adults work harder to raise chicks to adequate condition for migration. The Sahara crossing is physiologically demanding - birds may lose 40% of body mass. In Africa, illegal trapping for food is significant in some countries. Climate change is altering the timing of insect hatches in ways that may desynchronise swallow arrival with food peaks. Each of these pressures imposes direct welfare costs on individual birds and collectively drives the population decline that threatens the species in Britain.