The Birch Fly
In this area one of the insects favouring super clean fast rivers like the Tromie and Feshie is locally known as the Birch Fly since it emerges from the rivers at about the time the Birch comes into leaf. It is one of a family of flies called Simuliidae, these are known as Black Flies in Canada. Their "bite" is followed by application of an anticoagulant so they can obtain blood. The wound is easily infected so has to be cleaned with antiseptic.