The infamous "IP over Avian Carriers" was actually a real RFC (1149) published in 1990 as an April Fools' joke. It proposed using pigeons to carry data packets - and someone actually implemented it with a whopping 55% packet loss rate.
The meme brilliantly illustrates "packet loss" with a dead bird. Because when your carrier pigeon dies mid-flight, that 4GB USB stick tied to its leg isn't exactly reaching the destination server.
Still faster than some rural internet connections though...