Possible Clues:

• Bird changes colour
• Wading bird — no nutters (anag)
• Sort of sandpiper
• Wading bird changes shade
• Goes by the timbre to identify the bird
• Bird changes vocal expression
• How this bird gets late afternoon sun on back?
• Shore bird done in by run to nest
• English coastal visitor changes colour
• Relative of sandpiper, named for how it seeks food