Related Clues:

• External parasites
• Adult nits
• Moochers
• Dog's woe
• Pet parasites
• Bloodsucking insect
• Cause of some head-scratching
• Pediculicide's target
• Spongers
• Evil intent
• Head residents?
• Pet problem
• Cause of head-scratching, perhaps
• Fumigation targets, sometimes
• Students may be searched for them in grade school