A Heffalump is a type of fictional elephant in the Winnie the Pooh stories by A. A. Milne. Heffalumps are mentioned, and only appear, in Pooh and Piglet's dreams in Winnie-the-Pooh (1926) and seen again in The House at Pooh Corner (1928). Physically, they resemble elephants; Shepard's illustration shows an Indian elephant. They are later featured in the animated television series The New Adventures of Winnie the Pooh (1988–1991), followed by two animated films in 2005, Pooh's Heffalump Movie and Pooh's Heffalump Halloween Movie.
Although the fifth chapter of Winnie-the-Pooh is titled 'In Which Piglet Meets a Heffalump', Piglet only actually meets a Heffalump in his imagination. In this chapter, Pooh and Piglet attempt bravely to capture a heffalump in a clever trap; however, no heffalumps are ever caught, and indeed they never meet a heffalump in the course of the books. The sole appearance of heffalumps in the books is imagined, as Pooh tries to put himself to sleep:
In the third chapter of The House at Pooh Corner, Pooh and Piglet fall into a similar trap (it is implied it was the same trap) 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 not 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.