Gold Crest with strange habit

I have a gold crest that has appeared recently.  It has been here for 3 days and has a habit of hopping from a conifer at the side of the lounge window onto the window ledge and pecking at the window.  I thought it was seeing its own reflection and have closed the blinds but it still comes and pecks at the glass.  It jumps up higher from time to time and moves along the ledge.  I have two cats and would hate anything to happen to this lovely little bird.  Its crest changes colour from yellow gold to and orange shade.