Heffalumps and Woozles are nightmarish creatures who first appeared in the 1969 featurette Winnie the Pooh and the Blustery Day. They haunt Pooh in his nightmare during the song "Heffalumps and Woozles". According to Tigger, Heffalumps and Woozles love to steal honey. They may look cute and cuddley on the outside, but on the inside they're monsters.
Heffalumps and Woozles are both stated to have the ability to transform, such as a Heffalump that turns first into a Woozle and then a Woozle with the head of a Heffalump, and a Heffalump with a yoyo that transforms first into a smaller Heffalump, then a Woozle, and then into a pot of hunny, out of which comes another Heffalump that eats all the honey and explodes.
The Heffalumps and Woozles came in every shape and size, such as the large Heffalump wtih a yoyo, which transforms into a transparent balloon Heffalump that sucks up a pot of honey and explodes, a Heffalump and Woozle duo, a Woozle who turns his nose into a horn, several Woozle soldiers with a tuba-playing Heffalump, a bee-like Heffalump, three Jack-in-the-box Woozles, a harp-playing Heffalump, two Heffalumps who use their trunks as accordians, a Woozle who lights the fuse of a Heffalump with a stick of dynamite on its head, a small flying Heffalump that transforms into a marching Heffalump wearing a green uniform with a popgun for a trunk, and several Heffalump-like hot air balloons, one of which then transforms into a watering can after failing to shake Pooh off.
- Heffalumps and Woozles appear similar to The Pink Elephants in Dumbo.