Rattrap

Rattrap, known as SO9 in Japan, is an enemy from Mega Man ZX. It is a small rat type Mechaniloid that is produced in large scale from a ground-mounted machine. The rats crawl on the ground, and the are prone to short-circuit and self-destruct a set amount of time after its production. As the rats are mass-produced, to stop them one should give priority to the machine producing them, which can only be damaged while open. They appear in Area L Research Lab.

New Rattrap
New Rattrap, known as New SO9 (ニューSO9) in Japan, is a new version of Rattrap that appears in Mega Man ZX Advent. These Mechaniloid mice tend to come in huge numbers. With so many of them, they are sometimes prone to short-circuit and blow up. They appear in the Bio Lab and can be summoned by Hedgeshock the Erinaceroid.

Trivia

 * Its English name, Rattrap, may be a reference to the Maximal of same name from Beast Machines: Transformers, whose transmetal vehicle form resembles the Mega Man ZX enemy.