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In the quiet region of the Seto Inland Sea, three km off the coast of the Japanese city of Takehara, in Hiroshima prefecture, lies Ōkunoshimabetter known as Usagi Jima or Rabbit Island. Today, the island is famous for being home to hundreds of wild rabbits that roam freely fed by tourists and living without predators. However, behind this idyllic image hides a dark past. In World War II the island was a secret center for the production of chemical weapons by the Imperial Japanese Army. The rabbits are “children” of that experiment, and now they are dying. A secret from the past. During the 1930s and 1940s, Ōkunoshima was the epicenter of the manufacture of so-called mustard gasphosgene and other chemicals used by Japan against Chinese soldiers and civilians. Estimates suggest that These toxic agents caused around 80,000 deathsand to test the effects that those experiments had a small rabbit fauna was launched onto the island which was increasing in number. To give us an idea, the strategic importance of the island was such that was removed from Japanese maps to keep their activities secret. Since then, there has been speculation that the number of current rabbits are direct descendants of those used in the poison gas testing experiments at the island’s military laboratory. According to Professor Ellis Kraussfrom the University of California, San Diego, most of the test rabbits were slaughtered by American forces after the Japanese surrender in 1945, but those that escaped their fate transformed the place. Rabbits and more rabbits. Therefore, and given that it seems unlikely that there are surviving creatures that inhabited the place during the military era, the question has always been to discern which are direct descendants and which are not, in which case, where the hell did they come from? One of the most accepted theories suggests that, in 1971, a group of students released about eight extra rabbits on the island. The absence of predators, the prohibition of hunting and the inability to keep pets such as cats or dogs have allowed the population to grow uncontrollably until it reaches approximately 1,000 individuals today. The impact of tourism. Although rabbits have made Ōkunoshima a very popular and tourist destinationthe increase in visitors has generated serious environmental and animal welfare problems. As? The practice of feeding rabbits inappropriate foods, such as cabbage, has led to digestive problems and nutritional deficiencies, reducing their life expectancy to just two yearsmuch less than in natural conditions. Besides, feeding dynamics are inconsistent: On sunny days and holidays, tourists provide large quantities of food, while on rainy days or out of season the animals are left without supplies, facing a shortage of resources, since the island’s vegetation has been devastated by overpopulation. And if all this were not enough, a mystery surrounds the island these days. They are dying without explanation. According to the Japanese authorities, More than 70 rabbits have died in circumstances not yet clarified. Last Thursday, Police arrested a man identified as Riku Hotta25, on suspicion of having kicked at least one rabbit on the island. The animal reportedly died shortly after the incident, prompting authorities to investigate whether there is a connection between Hotta and the discovery of those 77 carcasses. between November 26 and January 12. The bodies of the 77 rabbits were apparently found with unnatural injuries, such as broken bones, which has further sparked concern among authorities and tourists. Possible causes of death. As we said, despite the arrest, authorities have not yet determined a conclusive cause for the death of the creatures. However, Japan’s Ministry of Environment has indicated that Possible reasons could include: Infectious diseases, which could have spread due to the high population density and irregular diet provided by tourists. Adverse weather conditions, especially the cold of winter, could be affecting the rabbits, whose food depends largely on occasional visitors. Human factors, such as acts of cruelty or negligence, since there have been cases of visitors not following animal care guidelines. In this regard, and given that the suspect (Hotta) is not a resident of the island, but of Otsu, in Shiga prefecture, located halfway across the country, it is being investigated whether he made sporadic visits to carry out said attacks. Meanwhile, the Japanese government has stressed that is working together with veterinarians and animal welfare organizations to identify the causes of these deaths, and does so while reinforcing surveillance and monitoring of the island to prevent future incidents. Future measures. There is no doubt that in a society like Japan, where pets occupy a prominent place, the incident has prompted calls to strengthen the island’s security and improve regulations to protect rabbits from possible aggressors. Options are being studied such as the installation of surveillance cameras, access restrictions and awareness campaigns to guarantee the well-being of the animals and the sustainability of the island as a tourist destination. The paradox of an island with a dark past. Rabbit Island represents a fascinating example of how a place’s military past can be transformed into a tourist attraction. Furthermore, it also highlights the challenges of human intervention (once again) in ecosystems. Image | Chih-Wei In Xataka | Japan sent the wrong creature to eradicate snakes from an island. The disaster was so big that it took half a century to solve it In Xataka | In 1940, a creature snuck onto an island in the United States and devoured everything. Today two of the species most feared by humans coexist alone