Food, cavalry mount, beasts of burden
komodo rhino is an animal from the Fire Nation, bred both as a beast of burden and for its meat in komodo sausages.
Hundred Year War, the Fire Nation used these creatures as cavalry mounts   or as beasts of burden,  often decorating them in red.  Komodo rhinos have been used in almost every  Fire Nation military operation, such as the Siege of the North and the  invasion of the Fire Nation, although they were most prominently used by the  Rough Rhinos.  Because of their widespread use by the Fire Nation Army, Fire Nation boot camps had an exercise designed to train new recruits in how to mount and ride a komodo rhino. 
The komodo rhino has a thick, "tough as steel" hide,
which serves as natural protection for its body. Three large, curved horns dominate its face; two curving down from its forehead and one curving upward from its snout.
The creature's mouth and jaw structure look somewhat reptilian, but the small ears on either side of its head are mammalian. Its torso resembles that of a rhinoceros, but ends in a long, dinosaur-like tail. The rhino's feet are short, muscular, and clawed.
The komodo rhino resembles both of its namesakes, the Komodo dragon and the rhinoceros.
It also resembles the ceratopsian dinosaurs, a group that includes  Triceratops, Styracosaurus, and Chasmosaurus.
There is a Fire Nation stuffed animal made in the komodo rhino's likeness.
 Akin to mechanical bulls, a mechanical komodo rhino was available for use at a bar in the Fire Nation.
The komodo rhinos shown in the film do not possess horns like their animated counterparts.
The Last Airbender After the Hundred Year War, a pro-bending team named itself the Kolau Komodo Rhinos.
 The komodo rhino was first domesticated by the Fire Nation during the Pho Zel Dynasty.
1.0 1.1 From older
Avatar: The Last Airbender official site, originally on Nick.com ( link). No longer updated.
Malis, Nick (writer) & Volpe, Giancarlo (director). (March 4, 2005). " The Warriors of Kyoshi". . Avatar: The Last Airbender Season 1. Episode 4. Nickelodeon.
Ehasz, Aaron (writer) & MacMullan, Lauren (director). (April 8, 2005). " Winter Solstice, Part 1: The Spirit World". . Avatar: The Last Airbender Season 1. Episode 7. Nickelodeon.
Wilgus, Alison (writer), Garagarza, Elsa (artist), Dzioba, Wes (colorist), Comicraft (letterer). " Don't Blow It!" (2009), .
Nickelodeon Comics Club
DiMartino, Michael Dante, Konietzko, Bryan (writers) & Filoni, Dave (director). (June 17, 2005). " The Blue Spirit". . Avatar: The Last Airbender Season 1. Episode 13. Nickelodeon.
Ehasz, Aaron (writer) & Filoni, Dave (director). (December 2, 2005). " The Siege of the North, Part 2". . Avatar: The Last Airbender Season 1. Episode 20. Nickelodeon.
DiMartino, Michael Dante (writer) & Volpe, Giancarlo (director). (November 30, 2007). " The Day of Black Sun, Part 1: The Invasion". . Avatar: The Last Airbender Season 3. Episode 10. Nickelodeon.
O'Bryan, John (writer) & MacMullan, Lauren (director). (April 28, 2006). " Avatar Day". . Avatar: The Last Airbender Season 2. Episode 5. Nickelodeon.
Hedrick, Tim (writer) & MacMullan, Lauren (director). (July 14, 2006). " The Desert". . Avatar: The Last Airbender Season 2. Episode 11. Nickelodeon.
Hamilton, Joshua (writer), Matte, Johane (artist), Dzioba, Wes (colorist), Comicraft (letterer). " Private Fire" (Serialized October 30, 2007 – July 29, 2008, by Book Three: Fire DVD volumes), Nickelodeon.
"Komodo Rhino". Distant Horizon. Retrieved on August 6, 2013. Archived from the original on July 2, 2011.
Lumumba, Rawles; Wilgus, Alison (writer), McWeeney, Tom (artist), Dzioba, Wes (colorist), Comicraft (letterer). " Combustion Man on a Train" (July 5, 2011 [ Dark Horse Comics edition]), Nickelodeon.
. Welcome to Republic City Nickelodeon (May 11, 2012). Retrieved on May 11, 2012. ↑
on Nicktoons Network. Avatar Extras for "The Warriors of Kyoshi"