The Guardian Country Diary: Nest raids by feral mink take their toll

The moorhen had tried again. My passing-by startled her out of her nest – a cup at the foot of a stand of fading yellow flag irises, not two metres from the lakeshore. Before I made an apologetic retreat, I took note of a single soft-spotted pale egg resting in the hollow. All being well, another five or six would follow.

All, however, was not well. This clutch, like the four before it, was raided by mink. The next time I came by, the nest contained only a fragment of shell. Themoorhen was pottering alone along by the far reedbed. It’s doubtful that she’ll try again this year.

There have been mink on the Aire since the late 80s at least. Yorkshire was an early stronghold for feral mink when the species – imported from the US to be farmed for its fur – escaped from captivity and began to breed in the UK, not long after the second world war. Now, many mink generations later, it’s no longer feral but decidedly wild.

The moorhen hasn’t been the only one to suffer. A mallard pair that hatched a clutch of 10 ducklings in early May saw that number reduced to five by hungry mink within 24 hours; the rest were picked off within a week or so. We wonder if other nests – the grey wagtails’ by the river, perhaps – might be at risk.

I try not to overreact to invasive species. Nature isn’t static; ecology is complicated. Sometimes, though – like now – it’s difficult to see the bigger picture.

Down by the river, bobbing in disorderly file around a spit of gravel, rocks and trash deposited by the winter floods, I saw six mandarin ducklings following their mother. More incomers – escapees, like the mink. Mandarins haven’t bred before on this stretch of the river. I’m glad they’re here; I hope they stay.


Published in The Guardian, July 1, 2016:

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