Sperm whales are the largest toothed predators on Earth, capable of extraordinary deep dives, but now face threats from ocean noise pollution, entanglement, and toxic contamination.
Sperm whales are culturally complex animals with distinct vocal dialects across populations. Military sonar has been linked to sperm whale strandings, likely causing disorientation. Entanglement in deep-set longlines and gillnets causes injury and drowning. Chemical contamination including PCBs accumulates through the food chain and is found at high levels in sperm whale tissue. Plastic ingestion causing gut impaction has been documented in stranded individuals. The loss of elder females disrupts cultural knowledge transmission to younger animals. Historical whaling decimated populations by over 70% globally, and recovery continues but slowly. Noise pollution from shipping is increasing in all major ocean basins.