Related Clues:

• Zealot
• Fool
• Birdbrain
• Crazy
• Crazy as a ___
• Crank
• Bird
• Fish-eating bird
• Hannibal Lecter or Norman Bates, e.g.
• Bird in a crazy simile
• Addle-head
• Fruitcake
• Lunatic
• Lake bird
• Water bird