All 7 lions featured in the MGM logos

Lions (in order of appearance)
1. Slats (1917–1928)
2. Jackie (1928–1956)
3. Telly (1927-1932)
4. Coffee (1932-1934)
5. Tanner (1934–1956)
6. George (1956–1958)
7. Leo (1957–2015)

full video about the history of the logo