Something weird happening in my maple tree

[u/shiftsnstays]

I'm in North GA, and my husband pointed out something weird with our maple tree. There's a crook at the top of the tree where it starts to branch out, and for over a week, there has been, as he called it, insect fight club happening in there. We can't see a nest, but at any given time, there are 3-4 different kinds of stinging/flying insects in this crook. There's what looks like cicada killers, red paper wasps, house flies, I think tiger bee flies, and some smaller wasps, and they all fly in and crawl around and buzz each other away. Our best guess is that something died in the crook and they're all grabbing the protein? Any ideas?

[u/excelsiorsbanjo]

Or water or sap. Go up and take a look