When something scutters, it moves quickly with a light sound, like a small animal running.
Scutters are usually small and quick, like a mouse or a bug.
Examples:
The mouse scutters across the floor.
I hear something scuttering in the bushes.
The bug scutters away when I try to catch it.
The squirrel scutters up the tree.
The little crab scutters along the sand.
The tiny beetle scutters on the ground.