Birding by instinct

Last Thursday, I had a feeling the conditions would be good for stork migration and tried watching from my balcony in the hope of connecting with some.  After an hour of seeing nothing whatsoever, I had given up and was getting ready to have a shower when a report came through of a flock of storks on the north-western edge of Brussels, heading in my direction.  Half-dressed, I rushed back out and spent the next fifteen minutes frantically scanning the sky and wondering why I couldn't see them until I finally spotted them.  They were moving quickly, however, and soon disappeared behind the trees but I reckon the flock contained around 150 White Storks, with a Marsh Harrier following behind!  Yesterday, I went out onto my balcony to hear a sharp call that just didn't sound right for a Robin and made me think of Spotted Flycatcher, although that was highly unlikely since I've only seen it from my balcony once before.  I then saw a greyish bird flit between the trees and managed to spot where it landed through a gap in the foliage.