Possible Clues:

• Spasmodic bird-watcher?
• Rare bird spotter
• One not still pursuing hobby?
• One nervously marking winger?
• Observer of booby and American warbler?
• Inter sorcerer with ornithologist
• Person obsessed with spotting rare birds
• Bird-watcher who tries to spot as many rare varieties as possible
• Watcher of The Birds, one showing nervousness
• Dedicated birdwatcher