Cairbre, the original Leo the Lion mascot for the Hollywood film studio Metro-Goldwyn-Mayer (MGM), is born at the Dublin Zoo on March 20, 1919.

Cairbre is renamed Slats and is trained by Volney Phifer. Slats is used on all black-and-white MGM films between 1924 and 1928. The original logo is designed by Howard Dietz and used by the Goldwyn Pictures Corporation studio from 1916 to 1924. Goldwyn Pictures is ultimately absorbed into the partnership that forms MGM, and the first MGM film that uses the logo is He Who Gets Slapped (1924). Dietz states that he decided to use a lion as the company’s mascot as a tribute to his alma mater Columbia University, whose athletic teams’ nickname is The Lions. He further adds that Columbia’s fight song, “Roar, Lion, Roar“, inspired him to make the lion roar.

Ironically, unlike his successors, Slats does nothing but look around in the logo making him the only MGM lion not to roar, although it is rumored that Volney Phifer trains the lion to growl on cue, despite the fact that synchronized sound is not officially used in motion pictures until 1927.

Slats dies in 1936.