A Bird warning me to stay away

 I  like to park at the far end of parking lots so that I can walk and stretch my legs before having to sit in a meeting. On 4-21, I came out of the meeting to the car and as I was getting into the car this bird flew down to the ground from the tree that was close by and started to tweet at me.  I got my camera out and took its picture.  Then it really gave me a show, telling me to get away.  I could tell I was close to its nest.  I thought it was so pretty. it needed to be shared.

 

Bird warning me her nest is near by

  Now if I could only figure out what type of bird it is.