Mystery flies

Mystery flies

Observation - Mystery flies - UK and Ireland. Description: I commented on here yesterday on the number of flies swarming in the area. I've been outside swinging my net and they aren't St Mary's flies but Greenfly!! Masses of them - good news for the birds!

I commented on here yesterday on the number of flies swarming in the area. I've been outside swinging my net and they aren't St Mary's flies but Greenfly!! Masses of them - good news for the birds!