The bright red and yellow color of Jimmy's Flamebird costume are reminiscent of the plumage of the flamebird, a Kandorian bird. Jimmy Olsen and Superman first adopt their Nightwing and Flamebird identities during an adventure in Kandor in January 1963 (S No. 158: "Superman in Kandor" pts. I-III; "Invasion of the Mystery Super-Men!"; "The Dynamic Duo of Kandor!"; "The City of Super-People!"). They employ them again during a second adventure, in August 1964 (WF No. 143: "The Feud Between Batman and Superman!" pts. I-II -- no title; "The Manhunters from Earth!").