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.
Water Birds is a 1952 American short documentary film directed by Ben Sharpsteen.
 It won an Academy Award in 1953 for Best Short Subject (Two-Reel).
 The film was produced by Walt Disney as part of the "True-Life Adventures" series of nature documentaries.
 It was shot in Technicolor by more than a dozen cameramen and was created in cooperation with the National Audubon Society and the Denver Museum of Natural History.
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.
Ratatouille ( ; ] ) is a 2007 American computer-animated comedy film produced by Pixar and released by Buena Vista Pictures Distribution.
 It is the eighth film produced by Pixar and was co-written and directed by Brad Bird, who took over from Jan Pinkava in 2005.
 The title refers to a French dish, "ratatouille", which is served at the end of the film and is also a play on words about the species of the main character.
 The film stars the voices of Patton Oswalt as Remy, an anthropomorphic rat who is interested in cooking; Lou Romano as Linguini, a young garbage boy who befriends Remy; Ian Holm as Skinner, the head chef of Auguste Gusteau's restaurant; Janeane Garofalo as Colette, a rôtisseur at Gusteau's restaurant; Peter O'Toole as Anton Ego, a restaurant critic; Brian Dennehy as Django, Remy's father and leader of his clan; Peter Sohn as Emile, Remy's older brother; and Brad Garrett as Auguste Gusteau, a recently deceased chef.
 The plot follows Remy, who dreams of becoming a chef and tries to achieve his goal by forming an alliance with a Parisian restaurant's garbage boy.
Seal Island is a 1948 American documentary film directed by James Algar.
 Produced by Walt Disney, it was the first installment of the "True-Life Adventures" series of nature documentaries.
 It won an Academy Award in 1949 for Best Short Subject (Two-Reel).
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.
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.
Bear Country is a 1953 American short documentary film directed by James Algar.
 It won an Academy Award at the 26th Academy Awards in 1954 for Best Short Subject (Two-Reel).
 The film was produced by Walt Disney as part of the "True-Life Adventures" series of nature documentaries.
Ratatouille": L'Aventure Totalement Toquée de Rémy ("Remy's Totally Zany Adventure"), also known as Ratatouille: L'Attraction and Ratatouille": The Adventure, is a motion-based trackless 3D dark ride based on the 2007 Disney·Pixar animated film "Ratatouille" in Walt Disney Studios Park located in Disneyland Paris, France and announced for Epcot in Walt Disney World.
Nature's Half Acre is a 1951 American short documentary film directed by James Algar.
 In 1952, it won an Academy Award at the 24th Academy Awards for Best Short Subject (Two-Reel).
 The film was produced by Walt Disney as part of the "True-Life Adventures" series of nature documentaries.

Question: Which film is older, Ratatouille or The Best of Walt Disney's True-Life Adventures?
Answer: The Best of Walt Disney's True-Life Adventures