Charlotte May Pierstorff

Charlotte May Pierstorff was an American girl of German descent who was shipped alive through the United States postal system by parcel post on February 19, 1914. After the incident, parcel post regulations were changed to prohibit the shipment of humans.
In 1997, Michael O. Tunnell wrote a children's book, Mailing May, revolving around May's childhood.

Mailing

On February 19, 1914, then five-year-old Charlotte May Pierstorff was mailed from Grangeville, Idaho to Lewiston, Idaho to visit her grandmother C. G. Vennigerholz, as this was cheaper than buying a train ticket. Charlotte, who weighed at the time, rode in the mail car with a 32¢ stamp on her coat.
Leonard Mochel, May's mother's cousin and railway postal clerk, accompanied her during the trip and delivered her to her grandmother's house.
This event indirectly caused the United States Post Office to bar all humans and live animals from mail delivery.