Possible Clues:

• Small birds emit it flying round about
• Do they like cheese mixed with their seed?
• Naughty sounding birds (not rodents)
• Short book on rodents and birds
• Chickadees
• What a cat dreaming it could fly chased?
• Fliers concealing it in trademark diamonds
• One in island race with rodents or birds
• Small birds
• Singers in empty theatre, it needing audio equipment brought in