In what book is a heffalump a fictional character
Heffalump: A Heffalump is a type of fictional elephant in the Winnie the Pooh stories by A. A. Milne. Heffalump:  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). Winnie-the-Pooh (book): Winnie-the-Pooh (1926) is the first volume of stories about Winnie-the-Pooh, by A. A. Milne. Winnie-the-Pooh (book):  It is followed by "The House at Pooh Corner". Winnie-the-Pooh (book):  The bouncy toy-tiger character of Tigger is not introduced until the sequel, "The House at Pooh Corner".
The House at Pooh Corner