Old-time sailors would keep ferrets. Even if the ferrets were unable to chase down and kill all the rats, they were able to infiltrated all the cargo, and drive the rats out in the open, where hopefully the cats could kill them. There was an old pulp mill on the Sebasticook river that kept ferrets. The ferrets did the dirty work, and cats and rat terriers took care of the clean-up.Because sailors believed they brought good luck?
Because sailors believed they brought good luck?