Heavy Anaconda is a major antagonist and the second to last monster sent by Nightmare Enterprises in the Kirby: Right Back At Ya! episode, Frog Wild. It is one of the few known predators of the elusive Demon Frog.
For once actually doing the best for Dream Land, King Dedede orders Heavy Anaconda to make sure that the possessed Kirby does not cause damage in Cappy Town. At that last moment, King Dedede allows himself to be possessed by the Demon Frog, but suddenly, Heavy Anaconda appeared and confronts the possessed Dedede. When Dedede turns back to normal, Heavy Anaconda immediately eats the Demon Frog as well as Dedede. Knowing that Heavy Anaconda is extremely dangerous and should not be wandering around, Meta Knight gives Tiff a torch, and she throws it to Kirby in an attempt to help him defeat the huge snake. When Kirby eats the torch and gains the Fire ability, he successfully burns Heavy Anaconda to a crisp, destroying it and saving Dedede (who was burnt and has no hammer) in the process as possible.
Heavy Anaconda is an extremely huge brown snake. It has a long body with a yellow underside and a spotted dark brown pattern running across its back. It also has glaring yellow eyes and pale yellow markings running across its long tail. It also has a red forked tongue. It is able to swallow virtually anything it wants whole, and its long fangs are extremely venomous.
- In Japanese, Heavy Anaconda is actually a pun. The Japanese word for heavy, "ヘビー/hebii", is similar to the pronunciation of the Kanji "蛇/hebi", which means "snake" and/or "serpent".
- Heavy Anaconda is the only monster that Fire Kirby does not spit fire at (instead, Kirby uses attacks that are seen in Kirby Super Star).
- Heavy Anaconda is the only monster that eats other monsters.