Princess Send Message By Pigeon : Princess Elizabeth writing the message with her sister holds the box containing the winged messenger. Princess Elizabeth and Princess Margaret Rose both of the who are guides, sent a message of greetings by carrier pigeon to Lady Baden-Powell yesterday Feb. 20. It was one of many messages sent by girl guides throughout the country on the occasion of "Thinking Day" which marks the birthday of the late Lord Baden-Powell. May 15, 1943. (Photo by Associated Press Photo).