[Spktyr]

The far north has this thing called ‘Winter’. Fleas freeze and die, and so do infected and unprotected rats.

[muawiyah]

Rats, voles, moles, lemings, etc. dig dens and live out the winter there. So do the fleas.

It's not like the fleas MIGRATE up from the Bahamas or something every Spring.

Does the name "NORWAY RAT" mean anything to you?