Goose stepping is for geese
Chumley was an employee of the Crystal Palace zoo in London in the 1960s. The caption says, "Chumley goose at London's Crystal Palace zoo soaks its feet in pan of water after a long day of "goose stepping."
Chumley's main mode of transportation, namely flying, most assuredly had been modified. No self-respecting goose would ground himself voluntarily, so zoo officials undoubtedly clipped his wings. Chumley's recompense - fleeting fame and a foot bath.