Tweety

Despite the widespread speculation that Tweety was female, he is and has always been a male character, something that he often has confirmed in The Sylvester and Tweety Mysteries. 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 "Tweetybird" as a plot device, and once called "The only living specimen". Moreover, the title song suggests that it 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 (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 has appeared in 48 cartoons.
from wikipedia