Note 1788 — BOOK VIII. THE NATURE OF THE TERRESTRIAL ANIMALS.
John Bostock translation
This is alluded to by Cicero in his letters to Atticus, and is mentioned by Ælian, Anim. Nat. B. vi. c. 41; B. xi. c. 19; and Var. Hist. B. i. c. 11.—B. The same is still said of rats, whence our expression “to rat,” i. e. to desert a falling cause.