### Okunoshima
Japan — Hundreds of aggressively friendly feral bunnies swarm the vine-choked ruins of a top-secret World War II poison gas factory.
Between 1927 and 1929, the Imperial Japanese Army built a highly classified chemical weapons facility here, literally erasing Okunoshima from public maps. The factories churned out over six kilotons of deadly mustard and tear gas before Allied forces finally dismantled the labs and disposed of the chemicals at the end of World War II.
Decades later, a small "founder population" of rabbits was introduced to the island—likely abandoned pets released by schoolchildren in 1971, or animals brought in to attract tourists. What happened next is a spectacular display of exponential biological growth. Because the island is completely predator-free (dogs and cats are strictly banned) and human visitors constantly subsidize their diets with snacks, the carrying capacity of the ecosystem artificially exploded.
A persistent internet myth claims today's fluffy residents are mutant descendants of test subjects freed from the wartime labs, but historical records prove all WWII test animals were euthanized. The thousands of rabbits begging for snacks today are just completely normal, wildly successful feral bunnies that conquered an abandoned fortress.