From the post:
Speckled Crawlers, like their Barbed cousins, occupy the lowest level of the Hordes’ food pyramid. They are the most plentiful species, partially because of their incredible ability to adapt to their environment. Upon arriving on Earth, the Crawlers took to the land, tunnels, buildings, forests, and every other environment they came across. They lurk in many dark and unseen places, waiting for prey to come into reach of their clawed hands. While Speckled Crawlers are not strong by themselves, they more than make up for this with strength of numbers.