Heffalumps are a species of the Winnie the Pooh series. They are thought to be fierce and fearsome, but as proved in Pooh's Heffalump Movie, they are actually kind and gentle. As confirmed by Pooh in The Many Adventures of Winnie the Pooh, they are really elephants.
In The New Adventures of Winnie the Pooh, Heffalumps are seen twice, in The Great Honey Pot Robbery with one working with a Woozle called Stan to steal some honey, but is afraid of Wooster. Others are seen in There's No Camp Like Home, where Tigger accidently steals their house thinking it is firewood and they break into a fight.