Vaquita

The vaquita is the most endangered marine mammal on Earth, with fewer than 10 individuals remaining in Mexico's Gulf of California. This tiny porpoise has declined 98% since 1997 due solely to illegal gillnets set for totoaba. Conservationists estimate that without removing these nets, the species will go extinct by 2025. By contrast, the Mountain Gorilla population has grown to 1,000, proving that determined intervention can reverse declines.