ARTICLE: Are Cities Making Animals Smarter?

The goldfish were the first to vanish. Every so often, a few would go missing overnight from the office’s tiny outdoor pond. But goldfish were cheap, so no one in the building—an environmental nonprofit in the bustling, sweaty center of Colombo, Sri Lanka—bothered investigating.

Then the dragon koi began to disappear. Lustrous and ethereal, each of these whiskered Japanese carp cost around 10,000 Sri Lankan rupees, or $65. In a fit of extravagance, the building’s landlord had bought 10. Soon, he had seven. Then three.

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