41. In flight, watch for the distinctive white shoulder patch, green speculum and black tail. 42. Both sexes have sky-blue wing coverts, a green speculum , and yellow legs. 43. The male is all black, except for white around the eye and a white speculum . 44. In flight, the lack of a white border to the speculum is a key difference. 45. Both sexes have blue speculum feathers. 46. In fact, the introduction of the speculum was far more controversial than that of the vibrator. 47. An aspect of the " Speculum Historiale " is the large space devoted to miracles. 48. The " Speculum Regale " describes other cetaceans, including the Sperm Whale and Narwhal. 49. The middle part is called Speculum , which refers to the special rounded mirror used by gynaecologists. 50. Two speculum ( an alloy of mostly copper and tin ) with arsenic to improve the finish.
