Javan Rhinoceros

Javan Rhinoceros is the rarest large mammal on Earth, with fewer than 80 individuals surviving in a single protected area, Indonesia's Ujung Kulon National Park. This critically low population makes it even more vulnerable than #2 Amur Leopard, which has roughly 120 adults. The species faces extreme risks from natural disasters and disease, as all individuals exist in one location, a precarious situation that underscores conservation failure. A single volcanic eruption or tsunami could wipe out the entire population, highlighting the urgent need for habitat expansion and disease monitoring.