Birds and running

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Across
  1. 4. london's long race(8)
  2. 6. running footware(8)
  3. 8. chew food and then?(7)
  4. 9. very dark colour(8)
  5. 10. britains smallest(4)
  6. 11. personnel_ _ _ _(4)
  7. 14. hens male partner(8)
  8. 15. on many Christmas cards(5)
Down
  1. 1. sleeps on one leg(8)
  2. 2. pass a fellow runner(4&4)
  3. 3. makes holes in trees with its beak(4&6)
  4. 5. Stanley likes this one(7)
  5. 7. expensive high flyer with sharp claws(6&4)
  6. 10. stop_ _ _ _ _(5)
  7. 12. eaten at Christmas(6)
  8. 13. you race against this one(5)