The People's Liberation Army of China has trained a small unit of macaques to protect a northern air force base close to Beijing.The monkeys’ handlers call their newest recruits the Chinese military’s “secret weapon.†These monkeys have been put here to take care of the huge flocks of birds that pose a threat to flights. According to China's Air Force News website, the macaques have been taught to destroy nests in nearby trees and chase away the birds that have become a nuisance during the take-offs and landings of fighter planes in the base whose exact location was not revealed.