DENVER (KDVR) — Big cities are populated by hundreds of thousands of people, but a hidden population even larger than the number of humans lurks in the shadows.

The population consists of hundreds of thousands or even millions of rats, depending on where you are in the country.

Pest control companies can't pin down an exact number of rats in the world but estimate there is about one to two rats per person. That number may pale in comparison to numbers like 2.5 million ants per person, but it's nothing to scoff at either.

There are about 8.2 billion people on Earth right now, which means with a one-to-one ratio, there would be 8.2 million rats, but that number can balloon to 16.4 billion with more generous estimates of two-to-one.

There's an old saying that you are never more than six f

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