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. In the fifth chapter of Winnie-the-Pooh , Pooh