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Rats: Years
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In Indonesia, rats are the number one pre-harvest pest of rice, with about 17% of the harvest lost each year -- enough rice for 20 million Indonesians. In Laos, rodents are the second most important agricultural pest in mountainous regions, and the one over which farmers feel they have the least control. Rodents are one of Vietnam's top three agricultural problems.
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No one knows exactly how many rats there are in Arlington. Neither can officials say whether there are more today than five years ago. But private exterminators say they are increasingly busy, and some estimate that the county's rat population has hit the defining mark for an urban area: one rat per person.1
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[W]hat do chirping, ticklish rats have to do with human laughter? The fact that rats have a form of laughter suggests it has been around for a very long time. Scientists have estimated that the common ancestor of rats and humans lived some 75 million years ago.
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It's estimated that total crop losses caused by rodents, mostly rats, each year would be enough to feed 200 million people, nearly as many as the population of Indonesia. That's probably a low estimate, and post-harvest damage is about the same again.
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