Endangered Sperm Whales Drowning in Drift Gillnets July 5, 2019 / activist360 / Leave a comment Sperm whales are getting trapped in mile-long drift gillnets and drowning as they struggle to break free. And these endangered whales aren’t the only ones. Drift gillnets kill more marine mammals than all observed U.S. West Coast Fisheries combined. Join Oceana to help save at-risk whales and other marine mammals from deadly and indiscriminate fishing gear.