"A leafy little tunnel runs through the undergrowth along the Black River in the Seattle suburb of Renton: an otter trail. It’s in hidey-holes like this that river otters leave detailed evidence of human misdeeds.
Just downstream, in the Duwamish River, droppings left by river otters reveal toxic PCBs and other industrial waste.
Here, in a woodsy city park where the Black River carries runoff from nearby subdivisions and business parks, otter droppings contain our antibiotics and the super-bacteria that they can generate.
Bacteria that resist antibiotic drugs are becoming more widespread in our environment."
Source: KUOW, 11/27/2018