Opening logo in Universal Pictures films:

A globe

Source: The Times, 1/1/1900

  Opening logo in MGM Pictures films:

A roaring lion
Called Leo, the lion was first heard in the 1928 film White Shadows of the South Seas.
Source: The Times (London), 6/30/2005

  Opening logo in Paramount Pictures films:

Snow-capped mountain
Studio founder William Hodgkinson designed the insignia, which was inspired by Ben Lomond Peak in Utah, where he grew up.
Source: The Times, 6/30/2005

  Opening logo in 20th Century Fox Films:

Stone logo with searchlights

Source: The Times (London), 6/30/2005