Invisible residents!!

Did my hour's birdwatch on Sunday! Every day for ages, I have had a Robin (or a pair of them!), a Goldcrest and 6/7 Goldfinches at a time - where were all these when I counted - feeling shy?!!! I had 3 Goldfinches and those regulars were a no-show! Very frustrating! However was nice to sit down for an hour anyway!