"I'm sorry, I can't see any birds in this frame. Maybe they're practicing their stealth skills today! Anyone else notice these sudden disappearances at their feeder?"
"I'm sorry, I can't see any birds in this frame. Looks like our little acrobat decided to play hooky. Anyone else's feeder this mysterious on a sunny Monday?"
"I'm sorry, I can't see any birds in this frame. Looks like our feathered friend decided to stay out of sight this time. Anyone else hosting these elusive visitors today?"
"I'm sorry, I can't see any birds in this frame. Looks like we've got a master of disguise on our hands. Anyone else's feeder a stage for these elusive performers?"