Some of today's most recognizable logos in the fast-food industry looked remarkably different when they were first introduced.

McDonald's first logo, for example, featured a winking cartoon chef called Speedee, a predecessor to the fast-food chain's current mascot, Ronald McDonald.

Meanwhile, Starbucks' original logo featured a topless siren, a two-tailed mythical creature similar to a mermaid, and competitor Dunkin' chose to shed the "Donuts" portion of its name and, with it, its old logo.

Below, see how the logos of 10 major fast-food companies have evolved over time.