The rat is called Scabbers. It is found out in book 3: The Prisoner of Azkaban that he is in fact an animagus (he's a wizard that can transform into an animal) by the name of Peter Pettigrew.
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Scabbers
It was the 2nd. Remember, Ron's wand was malfunctioning, so he had trouble with it.
Roscoe was the rats name, the rat that loved the light.
No way are they rats some rats and chipmunks may look alike but no the chipettes and chipmunks are not rats.
Billy Unger Chase is the youngest & the smartest of the Lab Rats.