Grunt is s Codex featured in Tom Clancy's Rainbow Six Extraction. It is unlocked by completing the Grunt Tagging Study in the New York City Region.
Transcript[]

INDEX Analysis:
Excerpt from civilian eyewitness account - "...then it ran after him like - fast!... Stabbed him with those arm-spikes and it was over. He was dead... I just got out of there."
The Grunt engages combat with two hardened upper limbs. Exact composition is unknown. Suspect carapace material. Projectile combat mechanism: Nonexistent.
EXTRAPOLATIONS:
Assessing biomechanical gait analysis: Implies muscular or analogous system. May approximate arthropods - hardened Sprawl shell activated by neuronal network connected to clusters agglomerated at weak points (ioints). Requires more data. (INSERT:Doc - Efficiency of movement does not seem to be affected by damage to limbs.)
Nature of Grunt's sensory apparatus is unknown. Possibly located in the head area (QUERY: cephalic?). Observational study confirms Weak Point Probability HIGH.
ENGAGEMENT PROTOCOLS:
Avoid alerting Grunts. Surprise and ambush tactics are recommended to prevent alarm response. (QUERY: Archaean 'Howl')
Damage to the cephalic area is most efficient. (QUERY: "obliteration")