Ah - I live just a half mile from these fields. It’s one of the historical quirks of the city; lots of common land open to the public, grazed by cows. Although

Ah - I live just a half mile from these fields. It’s one of the historical quirks of the city; lots of common land open to the public, grazed by cows. Although there’s fencing on other boundaries of the grazing land it simply isn’t practical to fence off the river - and as someone who also rows on the river I usually see a cow in the water at least once a year, so it’ll be interesting to see if they work!