![]() This fascinated Calhoun-if the rats had everything they needed, what was keeping them from overrunning his little city, just as they had all of Baltimore? Why couldn’t they thrive in a rodent utopia? The subsequent utopias. They started acting weirdly, rolling dirt into balls rather than digging normal tunnels. At that point, the rats became too stressed to reproduce. He expected to be able to house 5,000 rats there, but over the two years he observed the city, the population never exceeded 150. In 1947, to keep a close eye on his charges, Calhoun constructed a quarter-acre “rat city” behind his house, and filled it with breeding pairs. The only adversity: space limitation – the size of the habitat was predicted to host 3840 mice. ![]()
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