Related Clues:

• Crackpot
• Zealot
• Fool
• Off-the-wall
• Bananas
• Birdbrain
• Crazy
• Crazy as a ___
• Totally nuts
• Bird
• Far-out
• Off the wall
• Fish-eating bird
• Hannibal Lecter or Norman Bates, e.g.
• Bird in a crazy simile