The Long-tooth Cat is an animal, presumably native to U.V.6. Riddick apparently used one of these creatures lower jawbone for his Long Tooth, and Hook knife.

The Long-Tooth

The Hook
The Long-tooth Cat is an animal, presumably native to U.V.6. Riddick apparently used one of these creatures lower jawbone for his Long Tooth, and Hook knife.
The Long-Tooth
The Hook