A hummingbird feeds on the nectar from a Mimosa tree in Saugus, Massachusetts on July 30, 2020. (Photo by Joseph Prezioso/ZUMA Wire/Rex Features/Shutterstock)

Metropolitan Police patrol as people party at the Soho district, as the coronavirus disease (COVID-19) restrictions ease, in London, United Kingdom on April 16, 2021. Pubs and Restaurants are expecting good business tonight being the first Friday night after Coronavirus lockdown rules were relaxed to allow outside dining and drinking. (Photo by Henry Nicholls/Reuters)

Race winner USA's Mikaela Shiffrin reacts as she is symbolically crowned on the podium after competing in the Women's Giant Slalom on January 24, 2023 in Plan de Corones (Kronplatz), Dolomites Mountains, as part of the FIS Alpine World Ski Championships. (Photo by Marco Bertorello/AFP Photo)

Performer and artist Aoi Yamada and film director Makoto Nagahisa perfom on stage during a conference at the Cannes Lions International Festival of Creativity in Cannes, France on June 21, 2023. (Photo by Eric Gaillard/Reuters)

Ivy on a house in North Queensferry, UK begins to turn from green to red as autumn draws nearer on August 26, 2024. (Photo by South West News Service)

A snowy owl (Bubo scandiacus) raised by a falconer as part of a captive-breeding program, pictured in its enclosure in Vysocina, Czech Republic on October 22, 2025. (Photo by Slavek Ruta/ZUMA Press Wire via Alamy Live News)

Alaa Shabat lives with her six children in a tent erected inside the Austrian cemetery in Khan Younis, southern Gaza Strip, on November 13, 2025, after her husband became ill and unable to work. (Photo by Tariq Mohammad/APAImages/Rex Features/Shutterstock)

Only after World War II did the secret spill: Ōkunoshima, located in the Inland Sea of Japan between Hiroshima and Shikoku, was the top-secret site for manufacturing chemical warfare. When the factories were closed down, a number of exotic wild rabbits were seen freely roaming the island. They were assumed to have been the test subjects for the chemical weapons, which the military failed to eradicate when the factory was demolished.