A Squirrel's Summer Cottage

When I was doing a little internet research on red squirrels yesterday, I discovered that they sometimes build a summer nest, called a 'drey', made of a mixture of twigs, leaves and such, usually on a tree branch next to the trunk. They can be quite sizable. It was then I knew what I had noticed recently in a tree in the wooded area on the trail. A few weeks ago, some fellow marsh walkers pointed out a bluejay's nest in a pine tree. Soon after that, the nest seemed to be abandoned, but one day when I looked, it had grown substantially in size, and I could see leaves among the new material. I haven't yet noticed any activity around the nest, but now I'm pretty sure who (what?) built it. I had to do a bit of maneuvering to get this shot this morning, but I think you can make out the nest.