Related Clues:

• They're burned by rebukers
• Headphones cover them
• Supports for eyeglasses
• There is no visible evidence of them on Spongebob, Patrick, or Squidward even though they can all hear one another
• 'Antenna'
• Prominent Spock features
• Where your buds hang?
• Contents of some cribs
• They have drums that are used to hear drums
• Items that may be pinned or pierced
• Mr. Spock's are pointy
• Cornstalk units
• All __ (listening carefully)
• Cranial projections
• Canal zones