Chaefka
From Halopedia, the Halo wiki
The arctic beast is one of several species encountered by a joint UNSC–Swords of Sanghelios task force encountered during an expedition to Installation 00 in 2555. They were similar in stature to the polar bears of Earth, but with taloned paws, tusks protruding from their faces, and toothed mouths sealed by a set of six mandibles.[1]
These creatures originally appeared in the concept art for Halo Wars.[2]
Sources