River dolphins are among the most endangered cetaceans globally. Restricted to freshwater rivers, they face threats from fishing gear, dams, pollution, and boat strikes.
River dolphins that become entangled in fishing nets drown slowly over minutes to hours, representing acute and prolonged suffering. Individuals that survive entanglement carry propeller wounds and net marks that cause lasting injury. Noise pollution from riverboat traffic causes chronic stress in echolocating dolphins that rely on acoustic signals for hunting and communication. The functional extinction of the baiji is a permanent welfare loss affecting every individual that drowned or starved during the decline. Prevention of further extinctions requires addressing entanglement, dam construction, and illegal hunting simultaneously.