Mrs. Frisby and the Rats of NIMH. "Their leader, Nicodemus, tells Mrs. Frisby of the rats' capture by scientists working for a laboratory located at the Nation

Mrs. Frisby and the Rats of NIMH. "Their leader, Nicodemus, tells Mrs. Frisby of the rats' capture by scientists working for a laboratory located at the National Institute of Mental Health (NIMH) and the subsequent experiments that the humans performed on the rats, which increased the rats' intelligence to the point of being able to read, write, and operate complicated machines, as well as enhancing their longevity and strength. This increased intelligence and strength allowed them to escape from the NIMH laboratories and migrate to their present location." (https://en.wikipedia.org/wiki/Mrs._Frisby_and_the_Rats_of_NIMH https://en.wikipedia.org/wiki/Mrs._Frisby_and_the_Rats_of_NI...)