Patrick Barkham on how a colony of rare butterflies living in a healthy elm has become a key element for citizens resisting Sheffield council tree felling

We tend to picture butterflies feeding on flowers, but five British species spend most of their lives in the tops of trees. These insects are often overlooked during their unobtrusive lives. But the white-letter hairstreak finds itself in the spotlight this month as local people fight to save a fine mature elm in Sheffield.

Related: Rare UK butterfly under threat as elms disappear

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Source: Guardian Environment