War pigeon <a href="https://en.wikipedia.org/wiki/Cher_Ami" class="extiw" title="en:Cher Ami">Cher Ami</a>
United States Signal Corps
United States Signal Corps via Smithsonian Institution, <a rel="nofollow" class="external free" href="http://historywired.si.edu/enlarge.cfm?ID=522&amp;ShowEnlargement=1">http://historywired.si.edu/enlarge.cfm?ID=522&amp;ShowEnlargement=1</a>