Question: What 1955 documentary was edited by Norman Palmer and released by Walt Disney Productions as part of its "True-Life Adventure" series?

Context paragraphs:
Perri (film): Perri is a 1957 film from Walt Disney Productions, based on Felix Salten's 1938 "Perri: The Youth of a Squirrel".  It was the company's fifth feature entry in their "True-Life Adventures" series, and the only one to be labeled a "True Life Fantasy".  In doing so, the Disney team combined the documentary aspects of earlier efforts with fictional scenarios and characters.

Norman R. Palmer: Norman Palmer (October 7, 1918 - March 23, 2013) was an American Disney television editor.  Palmer worked for Disney for around 45 years and served as a mentor to Roy Disney, who was appointed vice-chairman of Disney productions.  Palmer was born and raised in California and graduated from Hollywood High School in 1937.  He joined the editorial division of Disney in 1940.  Palmer edited films including The Living Desert, The African Lion, Water Birds, The Shaggy D.A., and The Legend of Lobo.  He died on March 23, 2013, of natural causes.

List of Disney animated shorts: This is a list of animated short films produced by Walt Disney and Walt Disney Animation Studios from 1921 to the present.  This includes films produced at the Laugh-O-Gram Studio which Disney founded in 1921 as well as the animation studio now owned by The Walt Disney Company, previously called the Disney Brothers Cartoon Studio (1923), The Walt Disney Studio (1926), Walt Disney Productions (1929), and Walt Disney Feature Animation (1986).

List of Walt Disney Pictures films: This is a list of films released theatrically under the Walt Disney Pictures banner (known as that since 1983, with "Never Cry Wolf" as its first release) and films released before that under the former name of the parent company, Walt Disney Productions (1929–1983).  Most films listed here were distributed in the United States by the company's distribution division, Walt Disney Studios Motion Pictures (formerly known as Buena Vista Distribution Company [1953–1987] and Buena Vista Pictures Distribution [1987–2007]).  The Disney features produced before "Peter Pan" (1953) were originally distributed by RKO Radio Pictures, and are now distributed by Walt Disney Studios Motion Pictures.

The Walt Disney Company: The Walt Disney Company, commonly known as Disney, is an American diversified multinational mass media and entertainment conglomerate, headquartered at the Walt Disney Studios in Burbank, California.  It is the world's second largest media conglomerate in terms of revenue, after Comcast.  Disney was founded on October 16, 1923 – by brothers Walt Disney and Roy O. Disney – as the Disney Brothers Cartoon Studio, and established itself as a leader in the American animation industry before diversifying into live-action film production, television, and theme parks.  The company also operated under the names The Walt Disney Studio and then Walt Disney Productions.  Taking on its current name in 1986, it expanded its existing operations and also started divisions focused upon theater, radio, music, publishing, and online media.

Walt Disney World Dolphin: The Walt Disney World Dolphin is a resort hotel designed by architect Michael Graves located between Epcot and Disney's Hollywood Studios in the Walt Disney World Resort in Bay Lake, Florida, next to Disney's BoardWalk Resort area.  It opened on June 1, 1990 and is joined to its sister hotel, the Walt Disney World Swan (also designed by Graves) by a palm-tree lined covered walkway crossing a lagoon.  The Walt Disney World Swan and Dolphin is a joint venture between the Walt Disney Company, Tishman Hotel Corporation, MetLife and Starwood Hotels and Resorts.  The land the resort occupies is owned by the Walt Disney Company, while the buildings themselves are leased by Disney to the Tishman Hotel Corporation and MetLife but operated by Starwood Hotels & Resorts Worldwide under the Sheraton Hotels brand.  The Walt Disney World Swan and Dolphin are a part of the Walt Disney Collection of resorts; because of this they are Disney branded and guests of the resort have access to special Disney benefits available to Disney Resort Hotel guests only.

The African Lion: The African Lion is a 1955 feature-length documentary that was released by Walt Disney Productions as part of its "True-Life Adventures" series.  The film, which was shot over a three-year period focuses on the life of the Lion within the complexity of the African ecosystem.  At the 6th Berlin International Film Festival it won the Silver Bear (Documentaries) award.

Mickey's House of Villains: Mickey's House of Villains (also known as House of Mouse: The Villains) is a 2002 direct-to-video animated film produced by The Walt Disney Company (Walt Disney Television Animation and Toon City Animation, with animation coordination by Walt Disney Feature Animation Florida.  It is based on the Disney Channel animated television series "Disney's House of Mouse" and a sequel to the direct-to-video animated film "", starring Mickey Mouse, Donald Duck, Minnie Mouse, Goofy, Daisy Duck and Disney Villains that have appeared in past Disney productions.  It was released on both VHS and DVD by Walt Disney Home Video on September 3, 2002.  It was followed by a 2004 direct-to-video animated film, "", produced by DisneyToon Studios, on August 17, 2004.

True-Life Adventures: True-Life Adventures series is a collection of fourteen full length and short subject documentary films produced by Walt Disney Productions roughly between the years 1948 and 1960.  The series won eight Academy Awards for the studio including three Academy Award for Best Documentary Feature awards for "The Living Desert", "The Vanishing Prairie" and "White Wilderness", and five Best Two Reel Live Action Short awards for "Seal Island", "In Beaver Valley", "Nature's Half Acre", "Water Birds", and "Bear Country".  It inspired a daily panel comic strip that was distributed from 1955 to 1971 and drawn by George Wheeler.  Several of the films were adapted in comic book format as one shots in the Dell Comics Four Color series.  The films were among the earliest production experience for Roy E. Disney.  Also this film series was the launching pad for Disney's new distributor, Buena Vista International.  TV episodes are from Disney's anthology TV series.

The Best of Walt Disney's True-Life Adventures: The Best of Walt Disney's True-Life Adventures is a 1975 American compilation documentary film produced by Walt Disney Productions, directed by James Algar and released by Buena Vista Distribution on October 8, 1975.  The film is composed of highlights from the Academy Award winning "True-Life Adventures" series of 13 feature length and short subject nature documentary films produced between 1948 and 1960.

Supporting paragraphs: Norman R. Palmer The African Lion
Answer: The African Lion