Ambient small mammal

From Halopedia, the Halo wiki

A fan-made image of Mister Chief created for use in Template:Realworld.
This article contains information about a non-canonical subject that, while official, is not part of the established Halo universe.
The small mammal.

This ambient small mammal is a deleted species from Halo 5: Guardians. The concept art was designed by 343 Industries artist David Bolton.[1]