Congregation of small flies

Congregation of small flies

Observation - Congregation of small flies. Description: A congregation of active flies on the mud fringes of a pond. They were moving in short bursts across the mud. They probably numbered around one hundred. They have been in occupation for at least ten days since I first saw them.It may of course be longer

A congregation of active flies on the mud fringes of a pond. They were moving in short bursts across the mud. They probably numbered around one hundred. They have been in occupation for at least ten days since I first saw them.It may of course be longer