This creature likes to eat grids or patterns used to establish scale or position
in the eyepieces of optical instruments.
Some optical instruments have reticles, which are scales on transparent materials
such as is found in optical instrumentation, and used especially used for aiming or measuring.
A reticle is a grid or pattern used to establish scale or position in the eyepiece of an optical
instrument. A reticle is also called a "reticule."