Which real lion has served as the longest-running mascot for MGM's famous roaring lion logo?

Film studio logos are some of the most recognizable brand symbols in entertainment history. These short sequences that precede movies have become cultural touchstones, with some dating back nearly a century. The roaring lion of MGM is perhaps one of the most famous brand mascots in cinema history, but how well do you know the story behind this iconic symbol? Test your knowledge of film branding history with this challenging question!

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Leo, who has been featured in the logo since 1957
Slats, the original lion used from 1924-1928
Jackie, who served as the logo from 1928-1956
Tanner, who was introduced in the 1980s digital remaster