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Blarggs are large dinosaurs commonly found inhabiting pools of lava in underground caverns. Blarggs resemble lazy-eyed lava dinosaurs, but Yoshi's Story depicts them as blob-like beings with large mouths, small arms and beady eyes, while numerous other games involve an assortment of similarly blob-like derived species.
Super Mario World
Blarggs first appear in Super Mario World as fairly rare enemies, encountered primarily in the Vanilla Dome. When Mario or Luigi approach a Blargg on a Lava Lift, the eyes of the Blargg will be visible before they dip back into the lava, moments before lunging. Yoshi is capable of jumping on them and, with some difficulty, eating them, the only way they can be defeated. The player can also opt to Spin Jump if lacking a Yoshi, although this method only prevents one from taking damage if landing on a Blargg or its eyes. They are mainly seen in Vanilla Dome 3, also making brief appearances in Vanilla Dome 1 and Chocolate Secret.
Super Mario World television series
Blarggs, though never referred to as such onscreen, appeared in two episodes of the Super Mario World animated series.
In the episode "The Wheel Thing", Mario and Luigi, having been banned to the Lava Pits, begin attempting to cook a pizza over a fire. The smell from this cooking pizza causes a Blargg to emerge from a nearby lake of lava and begin to chase Luigi, attempting to eat the plumber. Luigi is rescued from being devoured as Mario swoops down and saves his brother as Cape Mario.
In a later episode titled "Mama Luigi", a Blargg makes a brief appearance. Luigi and Yoshi, while running away from a pair of Tyrannosaurus Rex, use a Blargg's head as a stepping stone to cross a river of lava.
Nintendo Adventure Books
Super Mario Adventures
Several Blarggs make a minor appearance in Nintendo Power's Super Mario Adventures comic, appearing in the lava flooded basement of Bowser's Castle. These Blarggs are used as stepping stones by Mario to reach a Warp Pipe leading to another part of the castle.
Mario & Wario
A Blargg appears in Honō no Dōkutsu, the fifth stage of Mario & Wario. It is nearly identical to its appearance in Super Mario World, but unlike its previous appearance, it is docile and merely part of the scenery.
Super Mario World 2: Yoshi's Island
No regular Blarggs appear in the translated versions of Super Mario World 2: Yoshi's Island; however, in the Japanese version, Gargantua Blargg and Nep-Enut are identified simply as Blarggs. They have different names in subsequent releases, being specified as "Big."
In Yoshi's Story, Blarggs are altered, being larger, and given small arms with a blob-like appearance. They appear in only one level, Stage 2-2: Blargg's Boiler. In this game, Blarggs don't harm Yoshi when touched, although Yoshi gets a forceful push from them. While they can't be harmed, Yoshi can throw an egg at one to force it back into the lava. There's also one Blargg which will briefly pursue Yoshi; this one's not affected by Eggs, however.
Other appearances and references
Blarggs, with their appearance resembling how they appeared in Super Mario World, were originally going to appear in Super Mario 64 as enemies in Lethal Lava Land, Bowser in the Fire Sea, and even Wing Mario Over the Rainbow as they were found in the game's coding. With GameShark codes, the player can make them appear on the level. No reason was given as to why the Blarggs were cut out of the code.
Blarggs are also referenced in both Mario & Luigi: Partners in Time and Super Paper Mario. In the former, they are mentioned by Kylie Koopa, while in the latter, a Sammer Guy named Raging Blargg can be fought.
Names in other languages