Birdie has flown the coop

The last we saw Birdie was Friday morning, when s/he flew down, cooed a little and I then sprinkled the grain mix in his/her little spot. I didn't see him/her Friday afternoon and nor today or yesterday. Either Birdie has found someone more benevolent than me, or, and this is probably most likely, Birdie has met with foul play in the form of some predator.