Question: Sylvester the Cat is part of what series of animated short films from Warner Bros.?

Context paragraphs:
Bugs Bunny: Bugs Bunny is an animated cartoon character; created in 1940 by Leon Schlesinger Productions (later Warner Bros.  Cartoons) and voiced originally by Mel Blanc.  Bugs is best known for his starring roles in the "Looney Tunes" and "Merrie Melodies" series of animated short films, produced by Warner Bros. During the golden age of American animation, his popularity increased.  This era led to his becoming an American cultural icon and the official mascot of Warner Bros.  Entertainment.

Looney Tunes: Looney Tunes is an American animated series of comedy short films produced by Warner Bros. from 1930 to 1969 during the golden age of American animation, alongside its sister series "Merrie Melodies".  It was known for introducing such famous cartoon characters as Bugs Bunny, Daffy Duck, Porky Pig, Elmer Fudd, Tweety, Sylvester, Yosemite Sam, Foghorn Leghorn, Marvin the Martian, Pepé Le Pew, Speedy Gonzales, Wile E. Coyote and the Road Runner, the Tasmanian Devil, and many others.  These characters themselves are commonly referred to as "the Looney Tunes".

Bad Ol' Putty Tat: Bad Ol' Putty Tat is a 1949 "Merrie Melodies" animated cartoon released by Warner Bros. starring Tweety Bird and directed by Friz Freleng.  Tweety must evade the titular "puddy tat," Sylvester the Cat, who is once again in hot pursuit of Tweety, just so that he can eat him for his own personal snack.  It provides an anomaly in the Sylvester & Tweety pairings: In this one, Tweety provides almost all the dialogue, and then mainly to the audience.  Tweety's voice is performed by Mel Blanc, who also screams out Sylvester's pain in mid-film.  The story was written by Tedd Pierce; he and fellow Warner Bros. cartoon writer Michael Maltese appear in caricature form as a pair of badminton players.

Life with Feathers: Life with Feathers is a 1945 "Merrie Melodies" cartoon, directed by Friz Freleng and produced and released by Warner Bros.  Pictures.  It was nominated for an Academy Award for Animated Short Film.  This cartoon marks the first appearance of the then-unnamed cat Sylvester.

I Haven't Got a Hat: I Haven't Got a Hat is a 1935 animated short film, directed by Isadore Freleng for Leon Schlesinger Productions as part of Warner Bros.' "Merrie Melodies" series.  Released by Warner Bros. on March 9, 1935, the short is notable for featuring the first appearance of several Warner Bros. cartoon characters, most notably future cartoon star Porky Pig.  "I Haven't Got a Hat" was one of the earliest Technicolor "Merrie Melodies", and (because of Walt Disney's exclusive deal with Technicolor at the time) was produced using Technicolor's two-strip process (red and green) instead of its more expensive three-strip process.

Back Alley Oproar: Back Alley Oproar is a Warner Bros. "Merrie Melodies" (Blue Ribbon reissue) animated short directed by Friz Freleng and originally released in theaters on March 27, 1948.  The short features Sylvester and Elmer Fudd as its main characters, voiced by Mel Blanc and Arthur Q. Bryan respectively.  The title is a play on "uproar" and "opera".  This is a rare exception for Sylvester as he wins in this cartoon.

Sandy Claws (film): Sandy Claws is a 1955 animated Warner Bros. "Looney Tunes" cartoon directed by Friz Freleng starring Sylvester and Tweety.  The voices are performed by Mel Blanc and Bea Benaderet.  This short was nominated for an Academy Award for Best Animated Short Film in 1955, the only Sylvester and Tweety cartoon to receive an Oscar nomination, but lost to "Speedy Gonzales" which was also directed by Freleng and also stars Sylvester.

Sylvester the Cat: Sylvester J. Pussycat Sr., usually called Sylvester, is a fictional character, a three-time Academy Award-winning anthropomorphic, 40, 50, or 60-Inch tall Tuxedo cat in the "Looney Tunes" and "Merrie Melodies" series of cartoons.  Most of his appearances have him often chasing Tweety Bird, Speedy Gonzales, or Hippety Hopper.  The name "Sylvester" is a play on "Felis silvestris", the scientific name for the wild cat species (domestic cats like Sylvester, though, are actually "Felis catus").  The character debuted in Friz Freleng's "Life With Feathers" (1945), but Freleng's 1947 cartoon "Tweetie Pie" was the first pairing of Tweety with Sylvester, and the Bob Clampett-directed "Kitty Kornered" (1946) was Sylvester's first pairing with Porky Pig.  Sylvester was not named until Chuck Jones gave him the name Sylvester, which was first used in Scaredy Cat.  Sylvester appeared in 103 cartoons in the golden age, appearing in the fourth most films out of all the Looney Tunes/Merrie Melodies characters, only behind Bugs Bunny, Porky Pig, and Daffy Duck respectively.  Three of his cartoons won Academy Awards, the most for any starring Looney Tunes character: they are "Tweetie Pie", "Speedy Gonzales", and "Birds Anonymous".

Rhapsody in Rivets: Rhapsody in Rivets is a 1941 Merrie Melodies cartoon directed in by Friz Freleng, and produced by Warner Bros.  Cartoons.  It is the first Warner Bros cartoon to feature the "Hungarian Rhapsody No. 2" by Franz Liszt.  It has no dialogue.  The cartoon was nominated for the Academy Award for Best Animated Short Film in 1942 alongside another Warner Bros. production by Freleng, "Hiawatha's Rabbit Hunt", but both lost to Walt Disney's "Lend a Paw".

Hawaiian Aye Aye: Hawaiian Aye Aye is a 1964 "Merrie Melodies" animated short, directed by Gerry Chiniquy and written by Tedd Pierce and Bill Danch, starring Tweety and Sylvester.  Sylvester and Tweety's voices are provided by Mel Blanc, while Tweety's owner Granny was voiced by June Foray.  That was the final theatrical cartoon to feature the duo of Sylvester and Tweety together, and the last appearance of Tweety in a theatrical cartoon until "Carrotblanca" in 1995.  It was also the last non-Bugs Bunny cartoon produced by the original Warner Bros. studio before it closed down in 1963, as well as the last Merrie Melodies short with the "target" titles and the last to use "Merrily We Roll Along" at the beginning and end of the short The title was inspired by a TV series produced by Warner Bros.  Television called "Hawaiian Eye".

Supporting paragraphs: Sylvester the Cat Looney Tunes
Answer: Looney Tunes