Blargg

Blarggs are large monsters commonly found in underground caverns in which magma is fierce and abundant. Originally, Blarggs resembled lazy-eyed dragons, but more recent depictions show them as being anything from blob-like beings with large mouths, arms and beady eyes to humanoid, limbed creatures.

Blarggs first appeared in Super Mario World as fairly rare enemies, encountered primarily in the Vanilla Dome. These Blarggs resemble the aforementioned draconic version of the creatures. In this appearance, Blargg, upon seeing Mario or Luigi approach on a Skull Raft, will try to lunge at them, roaring menacingly. Blarggs could not be defeated by any conventional means for the most part and can only be avoided, though Yoshi is capable of jumping on them and, with some difficulty, eating them.

Super Mario World Animated 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.

Comics
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 level of the castle.

Yoshi
In Super Mario World 2: Yoshi's Island and Yoshi's Island DS, Blarggs are changed completely in appearance, but retain their attack pattern of lunging at the player, but now cannot be jumped on by a Yoshi, but can be subdued by having a Yoshi Egg thrown at them. In addition, they no longer only dwell in lava - water-dwelling Blarggs called Nep-Enuts are shown inhabiting rivers. In Yoshi's Story, Blarggs are once again altered, being larger and given small arms, they appear in only one level, Stage 2-2: Blargg's Boiler.

Sub-Species

 * Nep-Enut – Blarggs that make their home in water. In the Japanese version, these are actually considered the norm, while lava-dwelling Blarggs are now considered a sub-species.
 * Crusher Blargg – Blarggs enormous in proportions, they have the ability to crush normally unbreakable stones.
 * Gargantua Blargg / Super Big Blargg – Extremely large Blarggs.

Trivia

 * The Czar Dragon, the boss of Barrel Volcano in Super Mario RPG: Legend of the Seven Stars, resembles a Super Mario World Blargg; likewise, the Red Dragon appearing in Stage 6-4: Magma Castle of Yoshi's Story bears a large resemblance to Super Mario World Blarggs as well.
 * Blarggs are referenced to in both Mario & Luigi: Partners in Time and Super Paper Mario; in the first game, they are mentioned by Kylie Koopa while in the other, a Sammer Guy named Raging Blargg can be fought.
 * Blarggs, their appearance resembling the Super Mario World version, were originally going to appear in Super Mario 64 as enemies in Lethal Lava Land, or another lava filled area, as they were found in the game's coding.
 * There is a Sticker of a Blargg in Super Smash Bros. Brawl.