My New Friend - The Indigo Bunting

I heard this little guy's "chip" or "spit" sound high in a tree in Valley Forge.  The sound got louder as I got closer.  I started chipping back and he stopped chipping and was very quiet.  I waited but I could no longer spot him, so I started to walk away when he flew to a branch much lower and closer to me and started the chipping sound again.  I spotted him and chipped back and he chipped back and we had just a wonderful photo session.