Yes, I've noticed this.
Reminds me of Obama and the fly.
Except the bird didn't need killing.
ADDED: I would have expected Bernie to come up with something more interesting to say. He had to imagine a different bird — a dove — and then use that bird for its stock metaphor, peace. Got to give him credit though just for being the sort of man a bird would come up to. Indicates some sort of fine gentleness of the soul. Or so I learned watching Disney movies....