Fire Chomp

Fire Chomps resemble Chain Chomp, but differ in several ways. First, they are not restricted by chains, instead floating along with a tail made of fire. At any time, they may shoot fireballs at Mario or Luigi. The fireballs are taken directly out of their four-fireball tail. When all four have been fired, the Fire Chomp will self-destruct, damaging the Mario brother if he's within the blast radius, and they live mainly in the sky.

Super Mario Bros. 3
In Super Mario Bros. 3, Fire Chomps only appear in World 5, the Sky. They float along as Mario and Luigi navigate the stage, harrying Mario's progress on the small platforms, especially in World 5-9, where the player has a limited amount of platforms he can jump onto in addition to an automatically-scrolling screen.

New Super Mario Bros.
Fire Chomps return in New Super Mario Bros., again with a four fireball limit. They only appeared in World 7-1. They can be defeated by just jumping on their heads. Unlike Chain Chomps, which are almost invincible (bar a few techniques and powers of special characters), Fire Chomps can safely be jumped upon. Doing so knocks them out of the sky.

New Super Mario Bros. Wii
In New Super Mario Bros. Wii, Fire Chomps were a bit more common, appearing in World 2-6 and World 9-6. Fire Chomps have the same attack pattern as in the previous game but have now developed a new attack in New Super Mario Bros. Wii. When this enemy runs out of fire, it will flash red and self-destruct seconds later, but not before chasing Mario much faster than it was originally doing. They can be defeated with a single jump like in the previous game, but oddly enough they can be defeated with fireballs.

Super Mario 64 and Super Mario 64 DS
The invincible Fire Spitters from Super Mario 64 and Super Mario 64 DS look like Fire Chomps in the remake where they can only be defeated by Yoshi's tongue.

Appearances In Other Media
Fire Chomps made several appearances in The Adventures of Super Mario Bros. 3, such as in the episode "The Beauty of Kootie", where several Fire Chomps act as crew members on Bowser's Doomship.