Tweety (also known as Tweety Bird and Tweety Pie) is a fictional Yellow Canary in the Warner Bros. Looney Tunes and Merrie Melodies series of animated cartoons. Tweety's popularity, like that of The Tasmanian Devil, actually grew in the years following the dissolution of the Looney Tunes cartoons.[citation needed] The name "Tweety" is a play on words, as it originally meant "sweetie", along with "tweet" being a typical English onomatopoeia for the sounds of birds. Tweety appeared in 48 cartoons in the Golden Age.

Despite the widespread speculation that Tweety is female, he is and has always been a male character; something that the character himself has often confirmed in The Sylvester and Tweety Mysteries TV series, as well as in many comic books created by Warner staffers. On the other hand, his species is ambiguous; although originally and often portrayed as a young canary, he is also frequently called a rare and valuable "tweety bird" as a plot device, and once called "the only living specimen". Nevertheless, the title song directly states that the bird is a canary. His shape more closely suggests that of a baby bird, which in fact is what he was during his early appearances. The yellow feathers were added but otherwise he retained the baby-bird shape.

Tweety is, for the most part, a good-natured character happily spending life in his cage or a nest. However, when a cat or other adversary threatens him, he can become downright malicious and devious, even kicking his enemy when he's down. In many of Tweety's appearances the bird is shown accompanying his owner, Granny.

Tweety's debut in A Tale of Two Kitties

Bob Clampett created the character that would become Tweety in the 1942 short A Tale of Two Kitties, pitting him against two hungry cats named Babbit and Catstello (based on the famous comedians Abbott and Costello). On the original model sheet, Tweety was named Orson (which was also the name of a bird character from an earlier Clampett cartoon Wacky Blackouts).

Tweety was originally not a domestic canary, but simply a generic (and wild) baby bird in an outdoors nest - naked (pink), jowly, and also far more aggressive and saucy, as opposed to the later, more well-known version of him as a less hot-tempered (but still somewhat ornery) yellow canary. In the documentary Bugs Bunny: Superstar, animator Clampett stated, in a sotto voce "aside" to the audience, that Tweety had been based "on my own naked baby picture". Clampett did two more shorts with the "naked genius", as a Jimmy Durante-ish cat once called him in A Gruesome Twosome. The second Tweety short, Birdy and the Beast, finally bestowed the baby bird with his name.

Another noticeable thing about Tweety is his occasional and rare habit of transforming into a giant Hyde version of himself, by accidentally consuming Hyde Formula. This was first seen in Hyde and Go Tweet, and happened again in the "London Broiled" episode of The Sylvester and Tweety Mysteries. Since then, this habit was also used in certain idents of the UK Boomerang channel.