Humpback whales have recovered significantly following commercial whaling bans, with ongoing welfare threats from entanglement, vessel strikes, and ocean noise pollution.
Humpback whale welfare recovery following the international whaling moratorium demonstrates the positive welfare outcomes achievable when human-caused welfare harms are substantially reduced. Individual humpback welfare challenges that remain include entanglement in fishing gear, which causes some of the most prolonged welfare harm in marine mammals: entangled whales may drag gear for days to weeks, becoming progressively exhausted and debilitated before death or rescue. Vessel strikes cause acute welfare harm ranging from immediate death to severe injuries that may take weeks to prove fatal. Ocean noise pollution from commercial shipping, military sonar, and seismic surveys disrupts the acoustic communication that humpbacks rely on for mating, social cohesion, and migration - welfare impacts that are harder to quantify but potentially significant for cognitively complex, acoustically sophisticated animals. The cultural transmission of humpback whale songs across ocean basins reveals cognitive complexity that strengthens the welfare case for protecting these animals from noise disturbance. UK sightings of humpbacks in Scottish and Irish waters provide growing evidence of population recovery and present new opportunities for welfare-conscious whale watching.