Thousands of miles of rivers in the United States are unsafe for swimming due to fecal contamination. Tests routinely show that the water in these rivers is teeming with bacteria linked to waste from humans, cattle, dogs, cats and even wild birds. On many rivers, nobody knows which animals produce the biggest share of this pollution. But now a new group of scientists called “poop detectives” have arrived on the scene. They’re biologists who use police methods to track down animal polluters.

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