Black flying insects

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Last week in Kent I came across swarms of flying insects. They were black, possibly flying as mating pairs. The shape was very distinctive with a tail/abdomen (or something) appearing to hang vertically downwards. Although their flight seemed laboured, I couldn't focus on one to get a better description, sorry. They were at the edge of a wood in the sun.

It's a long shot, but can anyone suggest what they are. I think they are common, I just don't get them at home.

[Nicola Main]

Sounds like St Mark's Flies to me, I have them up at my local patch now too and they are pretty freaky when flying right at head level with you. St Mark's fly - Bibio marci - Natural England

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Hi Nicola,

You might be spot on there, and if not, I think you have sent me heading in the right direction.

Thanks!

Bev

[WhiskyBottle]

I'ld go with St Marks fly or similar too. They do settle if you watch them. 'Here's one i made earlier'

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Thanks Martin, nice picture. The more I read, the more I think it could be them, thanks!
Bev