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.
A render by Bungie employee Paul Russel.

The Vulpard was an ambient lifeform intended to inhabit Installation 04 in Halo: Combat Evolved. As the name suggests, it was a quadruped with leopard-like spotted fur and a powerful, vulture-like beaked head. It was cut from the final game.[1]