These may be eagles, and I think they’re too big for crows. I couldn't tell for sure while watching them and am still not sure in looking at the pictures. 15 of them were just west of 10th and Park, way up in the air, soaring in quiet (crows would have been talking), lazy circles, heading east (i.e., away from the river). It reminds me that last Sunday I was on the bus and watching out the window. I just happened to see, west I-25 at Central, a very similar large, single bird soaring. So... could they be eagles?