Talk:Galvani's Speculation/@comment-192.0.189.206-20160120033359

"Coriander's zoological survey describes only the ordinary rat, which means plague rats have only been here for five or seven years at most." From this statement, we can assume that Coriander's survey began around 7 years ago and spanned over at least two years. Either the rats were introduced just as the survey ended ("five years ago"), or they were introduced right after the survey started and Coriander missed them/didn't include them for various reasons (there wasn't enough rats at the beginning to warrant study, the survey only covers organisms who have lived in the Empire for a specific amount of time, etc.).