Inspector

Inspectors, also known as Hydras are creatures added to version 1.9 of the game. They vary in color and have three long heads. They act as protectors of Iterator's.

Appearance
Inspectors have three one-eyed heads attached to long necks that radiate from a central body. The body has thin protrusions that vary in number between individuals arranged like a propeller, as well as trailing fibers similar to those on the red tendrils and surfaces throughout Five Pebbles. Inspectors are either blue (Five Pebbles) or yellow (Looks to the Moon), becoming red when enraged.

Abilities & Behavior
Inspectors are initially passive, roaming through the zero-gravity environment. The fibers trailing on their bodies may reach out and contact fibers in the environment, lighting up blue at the ends.

Aggression
Inspectors become aggressive if hit with or s, or if the Slugcat handles  in their presence. They flash between red and white when angered, and throw nearby debris at the Slugcat, including Spears. If any held Neuron Flies are released they may become passive again.

Trivia

 * When pulled by an intense force, Inspectors briefly shift in color.
 * On death, Inspectors explode and leave no body behind, with only their eyes surviving. It seems they're mostly made of energy.