Possible Clues:

• Spray targets
• Grasshoppers' cities
• They're all six-footers in various churches
• We are over-run with a race of vermin they call wits, a generation of -- that are always making a noise.' (Thomas Otway, The Atheist)
• Dragonflies and fireflies, e.g
• Aardwolf's diet
• Antennae holders
• What swallows swallow
• Cricket class
• Small animals