Imagine a genetic survivor that endured ice age migrations and a historical bottleneck, now clinging to existence with perhaps only seven to ten individuals left. The vaquita isn’t dying from climate change, disease, or inbreeding. It’s being driven to extinction purely by accident, caught in the crossfire of a multimillion-dollar black market for the cocaine of the sea. This episode unravels how the world’s smallest marine mammal got trapped by global economics.

We profile this elusive little cow of the Sea of Cortez, only discovered as a species in 1958, and explain how gillnets set for the totoaba fish drown vaquitas as bycatch. We explore the cartel economics of totoaba swim bladders, the U.S. shrimp connection, the failed captive breeding attempt, the genetic armor against inbreeding, and the desperate measures, including concrete blocks dropped to snag illegal nets.

• How the vaquita’s tiny, murky habitat makes it uniquely vulnerable
• Why $100,000-a-day poaching profits defeat government buyouts
• How capture myopathy killed efforts to breed them in captivity
• The genome study showing they purged harmful mutations long ago
• The biobanking backup plan and its moral-hazard debate