On my trip to Lows Lake in early October I watched what I took to be two adult eagles contesting ownership of a carcass. They were intently focused on something in the swampy margin of the Bog River above the lower dam. Starting with one of the birds perched on a snag rising from the marsh, and the other in a nearby tree, they flew at each other repeatedly before returning to their spots. At one point the bird on the snag dropped out of sight for a few moments before returning to its perch.
Eventually my presence (in my canoe) started to bother them, sending them up into nearby trees. From there they watched and circled. Keeping track of me and each other.
My best guess was that there was a food source, a deer carcass maybe, in the marsh and they both wanted it. I’ve seen multiple eagles hanging around a carcass on winter ice but it appeared that in this case they were not interested in sharing. Other explanations are possible, but given the time of year and the behavior I did not get the impression that they were trying to make friends.
While working on this post I came across this interesting discussion of eagle behavior and ecology.