Related Clues:

• They're annoying
• Termites and such
• 41-Across, e.g.
• Gnats and moles
• Gnat and rat
• Raid victims
• They may be hard to get rid of
• Swattable sorts
• Mosquitoes, e.g.
• Exterminators' targets
• Annoying types
• Orkin victims
• They're exterminated
• Cockroaches, for example
• Baby brothers, typically