Razorclaw Beetle

The Razorclaw Beetle is a species of insect native to Yanth. Each is a half-metre sized flyer with talons so sharp they have been known to take off a man's head without even slowing the creature as it speeds past.

Often, the first sign of a Razorclaw attack is the screams of victims and witnesses as detached limbs fall to the ground and are rapidly devoured by carnivorous flora.

Source

 * Dark Heresy (2nd Edition): Enemies Without (RPG), pg. 100