A rat being trained by the Cambodian Mine Action Centre (CMAC) is pictured on an inactive landmine field in Siem Reap province July 9, 2015. Gambian pouched rats were deployed to Cambodia from Tanzania in April by a Belgian non-profit organization, APOPO, to help clear mines. They've been trained since they were 4 weeks old. Cambodia is still littered with landmines after emerging from decades of civil war, including the 1970s Khmer Rough “Killing Fields” genocide, leaving it with one of the world's highest disability rates. APOPO has used the rodents for mine-clearing projects in several countries, including Angola, Mozambique, Thailand, Laos, and Vietnam. (Photo by Samrang Pring/Reuters)

A rat being trained to detect mines is seen inside a cage at the Mine Detection Rat Training, Trial and Testing Project in Siem Reap province July 9, 2015. (Photo by Samrang Pring/Reuters)

A handler holds a rat undergoing training to detect mines at the Mine Detection Rat Training, Trial and Testing Project in Siem Reap province July 9, 2015. (Photo by Samrang Pring/Reuters)

A man from the Cambodian Mine Action Centre (CMAC) gives food to a rat undergoing training to detect mines at the Mine Detection Rat Training, Trial and Testing Project in Siem Reap province July 9, 2015. (Photo by Samrang Pring/Reuters)

A handler holds a rat undergoing training to detect mines during a training on an inactive landmine field in Siem Reap province July 9, 2015. (Photo by Samrang Pring/Reuters)

A handler takes a rat undergoing training to detect mines to an inactive landmine field at the Mine Detection Rat Training, Trial and Testing Project in Siem Reap province July 9, 2015. (Photo by Samrang Pring/Reuters)

A rat undergoing training to detect mines follows a member of the Cambodian Mine Action Centre (CMAC) during a training session on an inactive landmine field in Siem Reap province July 9, 2015. (Photo by Samrang Pring/Reuters)

A rat undergoing training to detect mines eats a snack during a training session on an inactive landmine field in Siem Reap province July 9, 2015. (Photo by Samrang Pring/Reuters)

A member of the Cambodian Mine Action Centre (CMAC) holds a cage containing a rat undergoing training to detect mines during a training session on an inactive landmine field in Siem Reap province July 9, 2015. (Photo by Samrang Pring/Reuters)

A rat undergoing training to detect mines is pictured on an inactive landmine field in Siem Reap province July 9, 2015. (Photo by Samrang Pring/Reuters)

A rat undergoing training to detect mines is pictured on an inactive landmine field in Siem Reap province July 9, 2015. (Photo by Samrang Pring/Reuters)

A rat undergoing training to detect mines eats a snack during a training session on an inactive landmine field in Siem Reap province July 9, 2015. (Photo by Samrang Pring/Reuters)