Every time I view that empty nest in the lilac bush I wonder how a bird could have made it and raised little ones in plain sight and I never noticed it last year.  The nest was smaller than a robin would have made.  It had to have been a small bird and I wonder the identity of that bird.  Every time I see the empty nest I wonder what else am I missing right in front of my nose.  All I can do is keep my eyes and hears (!! ears !!) open and await my next discovery.