At first glance, there’s nothing remarkable about Mexico’s tequila splitfin fish. Only two and a half inches long, the fish aren’t colorful or poisonous. They aren’t particularly fast. They don’t change colors or exhibit other strange behaviors. In many ways, they are forgettable. So when the fish, endemic to only a single spring-fed river near the Tequila volcano in the Mexican state of Jalisco, went extinct from the wild in 2003, there was no international outcry or even an article in a local newspaper to bid the fish adieu. But…
