Those are the screeching....squirrels?

Just before noon, I rambled across the little patio/plaza area outside the 2nd floor of our building. It's a lovely, shaded, brick and grass area where smokers gather to pollute the air just outside the doors. But once you wade through the haze, it's a very pretty place to sit and enjoy a few moments respite, or just amble across and down the stairs to the street and the lunching options that await. It was in this general direction I was headed when I heard

*chuckchuckchuck* *screee*

The *screee* part being much like that of the cry of a hawk or falcon (or bird of that variety, you know the one, right?) So I stopped and looked, first on the ground, because it had sounded kind of weak. Too loud to just be far away, but there was something definitely "off" about it. Visions of a wounded bird on the ground plagued me, so I scoured the area, ear at the ready for any sound that might lead me in the right direction.

There was nothing. But the sound was louder, so I said to myself, "Well, self, maybe it's in the tree and injured or in the sky directly above." A quick glance at the sky revealed no circling birds, so I carefully inspected the branches of the tree just in front and above me.

And locked eyes with a squirrel. "Hello," I offered with a smile, and continued scanning the branches. But then movement and *chuckchuckchuck* *screee* snapped my gaze back to the squirrel, who was now engaged in much tail and fur fluffing and waggling of its head.

I can only surmise that this noise was eminating from said squirrel. Can someone tell me if the little guy was ill or attempting to entice a girl squirrel or about to dine on human flesh or...? I looked on my way back, but he, and the noise, were suspiciously absent.