Sperm whales — the largest toothed predators on Earth — face threats from ship strikes, plastic ingestion, noise pollution, and historical whaling legacy affecting individual welfare and population recovery.
Sperm whales that ingest large quantities of plastic suffer gastric impaction — their stomachs fill with indigestible material preventing normal feeding, causing progressive starvation. Noise pollution from airguns used in seismic surveys can cause temporary and potentially permanent hearing damage in animals whose entire sensory world depends on sound. Ship strikes cause traumatic fatal injuries in the open ocean far from any possibility of assistance. The cultural transmission of knowledge within matrilineal groups means that the death of older females removes irreplaceable knowledge from the group — a welfare loss that is social and ecological rather than purely individual. The cognitive sophistication of sperm whales — including their distinctive clan dialects — makes their suffering under human pressures morally particularly significant.