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Documenting the Unique Contributions of Sloths in World War II

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Documenting the Unique Contributions of Sloths in World War II

A Slow and Steady Crew Member Helped Keep a Royal Air Force Bomber Flying in World War II

Gemnode, April 18, 2023November 24, 2023


During World War II, the Royal Air Force (RAF) of the United Kingdom faced many challenges in keeping their planes in top condition. One of the biggest obstacles was the need to fix mechanical problems in hard-to-reach places in flight on a mission. That’s when they turned to an unlikely ally: a sloth named Harold.


Harold was initially discovered by a group of RAF mechanics during a training mission to the rainforests of South America. They were struck by the sloth’s natural ability to move slowly and gracefully through the trees, and believed that he could be trained to crawl into tight spaces on their planes to fix mechanical problems.

Harold was trained to perform a number of tasks, including crawling into tight spaces to fix jammed weapons belts, landing gear, cables, bellcranks, pulleys, and push-pull tubes. His slow and steady movements allowed him to navigate these small spaces with ease, and he quickly became an invaluable member of the RAF mechanics crew.

One particularly memorable mission involved a damaged bomber that had sustained substantial damage over enemy territory. The RAF crew was desperate to repair the damaged landing gear so that the bomber could land safely once returned to friendly territory. Harold was their only hope to crawl into a small space in the lower fuselage and fix the damaged pulley system, which was causing the landing gear to malfunction.

Despite the danger and difficulty of the task, Harold remained calm and focused, using his natural abilities to navigate the tight space and make the necessary repairs, pulling the cable free, like a vine off a tree. Thanks to his efforts, the bomber was able make it back to base and land safely.


Harold went on to serve in many missions with the RAF mechanics crew, earning their respect and admiration for his dedication and skill. His story is a testament to the importance of teamwork and innovation in times of war, and to the incredible abilities of animals when they are trained to work alongside humans.

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