Bird sitting on a fence

Do you sometimes have strange feeling as if someone is watching you?  It happens to me when I stay at home and am moving near the windows or balcony door. One day I finally found out why I have so strange feeling. I have discovered a bird likes to sit on my wooden fence, and is watching anything that moves around. I suspected him on spying on me, however, bird cannot think and he is probably looking for something to eat.