Scuttlebugs will scurry away if they notice a player. It is recommended to sneak up to them to kill them.
Attacks
Scuttlebugs are passive and do not attack.
Trivia
It is possible for the player to crouch directly in front of the Scuttlebug. Implying that they're completely blind, and rely on sound or vibrations.
The Scuttlebug is treated more like a destroyable object than an actual creature. Looking at it shows the "breakable" icon and the Vacuum can destroy it.