Dodongo

Dodongos are large, lizard-like enemies that are usually found in caves and mountainous environments. In all depictions, bombs are usually an effective weapon against them.

Dodongo in The Legend of Zelda
The second boss of the The Legend of Zelda is the earliest form of a Dodongo, the lizard-like creature. It is vulnerable to what most Dodongos are, bombs. A bomb ingested by the creature will explode inside its stomach. Two bombs will kill the beast, giving you the second piece of the Triforce of Wisdom.

Alternate Strategy: In addition to feeding bombs to this behemoth, you can also fell the beast with only one bomb. This comes in especially handy when you're short on bombs, or you're battling multiple Dodongos later in the game, or both. It takes a bit of precision, but you can lay a single bomb near the foe, as close to its path as possible without causing it to swallow the explosive. If placed correctly, the bomb will stun the creature, freezing it in place. Sometimes you can even stun multiple Dodongos with one bomb! Stab the Dodongo in the belly with your sword while it is stunned and there's one less smoke-hating armored monster in the world of Hyrule.

Dodongos in Ocarina of Time and Majora's Mask


In Ocarina of Time they are found in Dodongo's Cavern, along with the Baby Dodongos. The Dodongo is a slow enemy which will try to damage you by breathing fire. Swipe its tail with your sword at least two times, and it will explode. The boss of Dodongo's Cavern is King Dodongo, which marks his first appearance in the series.

In Majora's Mask they are found north of Clock Town. They are larger than their Ocarina of Time counterparts and consequently take many more hits to kill.

Dodongo in Oracle of Seasons and Oracle of Ages
The Dodongo makes an appearance in the Game Boy Color game Oracle of Seasons. Like Dodongos from previous games, this one is vulnerable to bombs. However, just having the beast digest the bombs in this game is not enough. Once the Dodongo eats the bomb, swallows, and has a little indigestion, grab the Power Bracelets and toss the beast into the spiked floor in the middle of the room. Repeat this process four times, and the second Essence of Nature, the Gift of Time is yours.

Also, a friendly Dodongo named Dimitri appears in both games.

Dodongos in Four Swords Adventures


The bosses of the Tower of Flames. Throw bombs into their mouths when they are about to breathe fire. After defeating them, you rescue the Green Maiden. There are also three more in the realm of the heavens, as well as the infamous King Dodongo. To defeat it, you must open a chest around the arena and of course, toss a bomb down its maw three times.

Dodongos in Twilight Princess
In Twilight Princess, Dodongos first appear in the Goron Mines and in other places throughout the game later on. These new incarnations of a common creature in the Zelda series are a bit more reminiscent of a real-world gecko, as they are much smaller and slimmer than previous versions. They still breathe fire and the tail is still the weak spot, although an arrow directly aimed into their mouth will kill them instantly. A bomb placed placed in front of their mouths when they breathe in also takes care of them, keeping the tradition of killing them by bomb ingestion.

Trivia

 * These are the only dodongos that can walk on the ceiling.