I have a tree near our parking area which appears to be attracting flies, bees (all types), butterflies, wasps and European hornets.
No idea how the tree is doing this or what type of tree it might be.
Even more perplexing is why all the hornets appear to be fighting each other. I’ve seen half a dozen pairs of hornets drop from the tree and fight on the ground.
Insects do go a bit doolally at this time of year as they are about to die off and get manic sugar cravings.
This happens when the queens stops producing eggs and the workforce has nothing to do other than look for fermented fruits and sugars - often on wild plum trees where fruit has been left.
So they get pissed, and then get more aggressive and fight and sting. (Sounds familiar?)
They fight over the sap that they draw from wounds in the tree (looks like an oak from the bark shot). One of the ways they hunt is to drop from a height onto their prey or adversary to force them to the ground.
Leaves not pointed enough for hornbeam, and don’t look tough enough for beech, so I think alder too. Looks like a pretty scrubby tree, and under a cable, so may well be self installed which also suggest alder - they get everywhere!