The St Mark's fly is small, black and shiny. It is so-called because it emerges around St Mark's Day, April 25th. Large numbers of adults can be found in woodland edges, hedgerows,…

Our most common hoverfly, the marmalade fly is orange with black bands across its body. It feeds on flowers like tansy, ragwort and cow parsley in gardens, hedgerows, parks and woodlands.

The alder fly is a blackish invertebrate, with delicately veined wings that it folds over its body like a tent. It can be found near ponds and slow-flowing rivers; the larvae living in the silt at…