Saint Mark’s flies

Today, 25th April is St Mark’s day and I have never seen so many St Mark’s flies around us. Whether it is the couple of warm days we’ve had over the Easter or just a bumper year for these odd little flies I am not sure. One of the distinctive features of these flies is their dangling legs. They are found around woodland edges, hedgerows and wetlands.

Bibio marci

St Mark flies – Bibio marci

I think when I took these photos only the males were about. They have larger eyes and are blacker and smaller than the females.

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The flies are harmless and feed on nectar so are also accidentally pollinators. They only have a short flying life cycle and spend much of their lies as larva in the soil when they eat rotting vegetation.

Bibio marci

Bibio marci

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