Preheat oven to 400 degrees. Place chicken in roasting pan, brush with olive oil and season with salt. With a zester or small grater, grate the rind off the oranges and save. Cut oranges in half and squeeze juice into a small, removing seeds. Pour juice over chicken, sprinkle with the zest and the cayenne pepper. Roast, covered, 25 minutes. Remove cover and roast another 15 – 20 minutes, or until golden. Serves 4 – 8.