“ Two groups of feathers need special attention, ” explains the Book of British Birds, “the flight feathers of the wings and the ‘ steering ’ feathers of the tail. ”
” Dua kelompok bulu membutuhkan perhatian istimewa, ” jelas Book of British Birds, ” bulu - bulu terbang yang ada di sayapnya dan bulu - bulu ’ kemudi ’ yang ada di ekornya. ”