Email slbaumgart [at] uchicago [dot] edu
Alas, no more messenger pigeons but we do have....
"A message-carrying pigeon being released from a port-hole in the side of a British tank, near Albert, France. It's a Mark V tank of the 10th Battalion, Tank Corps attached to the III Corps during the Battle of Amiens." 1918. Image from the collections of the Imperial War Museums via Wikimedia Commons.