Scrapmetal

Scrapmetals are a race of Cybertronian-like vermin from the depths of Cybertron.

Anatomy
Scrapmetals share a similar biology to Cybertronians except they transform into four-legged "spider tanks" with rear-mounted cannons.

Powers and abilities
Scrapmetals share many of the same abilities as Cybertronians.

Scrapmetal are almost never witnessed as individuals, only in large swarms that can overwhelm robots far larger than them through sheer strength of numbers, no matter how many of their own dead they skitter over.

While they have only a base animal-level intelligence, Scrapmetals appear to follow the orders of a single sentient Scrapmetal that is physically identical to his kin, but just bright enough to make the swarm really dangerous by giving them direction.

Weaknesses
Scrapmetals are small and weak, meaning that they can easily be crushed.

Culture and society
Scrapmetals behave somewhat similar to both Earth locust and Scraplets. They are a dangerous scourge that swarm from planet to planet, devouring everything in their path and now thousands of them have infested the abandoned planet Cybertron.

History
Little is known about where Scrapmetals originate from, or why they look very much like Cybertronians. Some claim that they were originally Terrorcons before they were mutated by the Unicron Singularity. Others claim they are descendants of Insecticons, who could produce clone minions.