Amphibians are the most threatened vertebrate class globally, facing welfare harms from chytridiomycosis, habitat loss, pollution, and climate change across all continents.
Amphibian welfare receives minimal attention relative to mammals and birds despite their substantial sentience evidence and the scale of their ecological crisis. Chytridiomycosis causes a prolonged, painful death — the fungus disrupts skin function causing osmotic imbalance and cardiac arrest over days to weeks. The welfare cost of mass chytridiomycosis events affecting species through entire populations is enormous, though the individual suffering is largely invisible to human observers. Pollutant exposure causes physiological harm including endocrine disruption, immune suppression, and developmental abnormality in amphibian populations near agricultural areas. The conservation crisis has genuine welfare dimensions that are separate from — and in addition to — the ecological values of amphibian biodiversity. Effective welfare response requires both conservation action and research into treatment methods that can be deployed in wild populations.