Sharquoi

"Q: What's a Sharquoi?"

- Press

"A: Very freaking dangerous."

- Frank O'Conner

The Sharquoi is in the Conversations from the Universe booklet found in Halo 2: Limited Collecter's Edition.

Background
The Sharquoi didn't make it into Halo: Combat Evolved, Halo 2 or Halo 3. It is unknown if it will make it into future games.

This has been assumed to be another Covenant race, although it is not known for sure. In a deleted scene, a mural can be seen showcasing the Covenant races, including a very large creature believed by some to be a Sharquoi. However, this creature could also be a Drinol, which had not yet been cut at that stage of development. There is no direct evidence, then, to state that the Sharquoi is the large creature, although it is difficult to think what else it could be. There is even a possibility that Sharquoi is the Covenant word for Drinol, although the name Drinol does not follow the same patterns of all the other human names.

Possible Halo 3 Appearance
Frankie has talked about playing Halo 3, and fighting Grunts and "something larger than a Grunt," supporting the idea that the Sharquoi will be seen in Halo 3. KP also mentions fighting Grunts and a "CENSORED".