A Heffalump is a type of fictional elephant in the Winnie the Pooh stories by A. A. Milne. Heffalumps are mentioned, but never appear, in Winnie-the-Pooh (1926) and The House at Pooh Corner (1928) and later featured in the animated The New Adventures of Winnie the Pooh (1988–1991) and Pooh's Heffalump Movie (2005). Physically, they resemble elephants; Shepard's illustration shows an Indian Elephant.
In the fifth chapter of Winnie-the-Pooh, Pooh and Piglet attempt bravely to capture a heffalump in a trap. However, no heffalumps are ever caught in their trap, and indeed they never meet a heffalump in the course of the books. The sole actual appearance of heffalumps in the books come as Pooh tries to put himself to sleep: "[H]e tried counting Heffalumps [but] every Heffalump that he counted was making straight for a pot of Pooh's honey ... [and] when the five hundred and eighty-seventh Heffalumps were licking their jaws, and saying to themselves, 'Very good honey this, I don't know when I've tasted better', Pooh could bear it no longer." We learn nothing more about the nature of the beasts in the writings.
In the third chapter of The House at Pooh Corner, Pooh and Piglet fall into a similar trap (it's implied it was the same one) and think that it was made by a Heffalump to catch them. Pooh and Piglet rehearse the conversation they'll have when the Heffalump comes, but Pooh falls asleep and when Piglet hears a voice, he panics and says the wrong thing. He is mortified when the voice turns out to be that of Christopher Robin.
Although this is never explicitly stated, it is generally thought that heffalumps are elephants from a child's viewpoint (the word "heffalump" being a child's attempt at pronouncing "elephant"): E. H. Shepard's illustrations in A. A. Milne's original books depict heffalumps (as seen in Piglet's dreams) as looking very much like elephants.
In Disney's adaptations of the stories, Heffalumps are first mentioned in the 1968 featurette Winnie the Pooh and the Blustery Day, and seem to be a product of Tigger's imagination. Heffalumps first actual appearance was in the television series The New Adventures of Winnie the Pooh. In both the animated films and all subsequent television series, they are also depicted as looking like elephants, albeit slightly cuddlier and less fierce than those Pooh imagines in the books and with rabbit-like tails.
In the animated television series, most heffalumps are enemies of Pooh and his friends. They are known to steal honey and are often associated with woozles. One particular heffalump named Heff was the dim-witted sidekick of Stan the Woozle and was afraid of Roo because he thought Roo was a giant mouse. (This is perhaps a reference to the Looney Tunes running gag of Sylvester mistaking Hippety Hopper for a giant mouse and the fear of mice inherent in elephants.)
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