What are small black insects flying over pond?
I live in SW Wiltshire, UK and recently have noticed many small black
insects (flies?) flying - continuously criss-crossing just above the water
in my pond. They seem to be searching. They drop down momentarily onto any
small thing on the surface - including the feet impressions in the meniscus
of water boatman.
Does anybody know what these are likely to be and what they search for?
cheers, Davy
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