Ours are farming aphids. I love them really...
The more you study them, the more fascinating they are.
Years ago when we were first married, we lived near Burnham Beeches and would often go for a Sunday walk there.
Aside from the Stag beetles, there are some magnificent wood ant colonies in there, huge mounds of tiny twigs piled on top smelling quite strongly of Formic acid, and somewhat aggressive if you poked them.
They are much bigger than your average garden ants and have even been recorded as bringing down and dismantling wood mice that have been foolish enough to blunder into their nest area.
Sadly, there don't seem to be any around this area in Devon that I'm aware of but I think you have them up in your place, they're certainly in some parts of the Highlands.