A soggy mound amid the grass stopped me in my tracks. I had spent the best part of an hour searching the heathland reserve, eyes to the ground, before I chanced across it close to a clump of gorse. It was nothing much to look at, admittedly. After a winter of heavy downpours the dome-shaped structure covered with tiny snippets of vegetation had slumped so that it resembled a spadeful of old lawn clippings. Yet beneath the bedraggled thatch was buried treasure: an exceptionally rare colony of narrow-headed ants (Formica exsecta) toughing out the colder months hidden from view.

Click here to read the rest of the article: Country diary: England’s only narrow-headed ants are toughing out winter | Environment | The Guardian