via Weird Vintage and Miss
Cellania
I found this vintage photo of Chicken man in Miss Cellania's always awesome blog (you guys should visit), and I demand explanation! Who's first?
Update 3/7/13 - Neatoramanaut Laurent De Ruyt found the answer: There is a french play by Edmond Rostand (who wrote Cyrano) called "Chantecler" about a Rooster who believes that his crowing causes the sun to rise. For the purpose of the play, actors are supposed to be dressed up as rooster, chickens and other farm animals, in a realistic fashion. The pic is merely a picture of one of the actors in one of the first rendering of the play in 1910. The 1910 poster of the play : http://www.larousse.fr/encyclopedie/data/images/1311216-Edmond_Rostand_Chantecler.jpg