Possible Clues:

• ". . . leave no ___ unstoned" (pun ending)
• See 23
• Arctic __: bird that flies between poles
• Bird may be seen in water nearby
• Bird to go round being heard
• Bird seen in the afternoon?
• Slender shore gull
• Arctic ___ (pole-to-pole migrator)
• Slender-billed seabird
• Noddy, for one