This week, a mink was caught on camera as it repeatedly snuck into one of the strategically located salmon counters in West Iceland’s Krossá river.

The Icelandic Marine and Freshwater Institute has set up 14 counters to track salmon populations, monitor wild salmon, and check for renegade farmed salmon. Nine of the salmon counters are equipped with cameras to improve the accuracy of the analysis.

This week’s unwanted guest was filmed as it was flushed through the counter, fighting against the current—presumably to hold its place and wait for salmon to feast on.

Guðni Guðbergsson, the director of the freshwater department of the Institute, said today that animals other than fish seldom make their way into the counter, but it’s not unheard of. Birds have bobbed through fish counters in Iceland, and otters have been known to sneak into them in Ireland.

The first mink in Iceland was imported from Norway in 1931, in an attempt to establish fur farming in Iceland. But the clever little mink made its way out into the wild and constructed a den, even though the weather wasn’t ideal for survival.