0 small animals and insects that can be harmful and are difficult to control when they appear in large numbers -- alimañas
Flies, lice, and cockroaches can all be described as vermin.
He thought all terrorists were vermin.
1 undesirable or troublesome pests such as fleas, rats, or mice -- parásito; chusma, gentuza
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Podemos completarlo paso a paso, por muy largo que sea el camino, y no se puede completar, por corto que sea el camino, si ni siquiera marcas tu huella.