Possible Clues:

• Yarn amount
• Pelt across Spain in flight
• Birds flying, seen from hide around edge of lake
• Group of fibers or flyers
• Loosely-coiled amount of yarn
• Birds aloft: grouse finally breaking cover
• Knitting purchase that anagrams to "Nikes"
• V formation
• Flight of geese identified by European in hide
• Lie finally in hide to see some birds in flight