St Kilda field mouse

noun1

1. •
   A subspecies of wood mouse, Apodemus sylvaticus hirtensis, endemic to the Hebridean island of St Kilda.

   • The St Kilda field mice that live on that isolated Hebridean island, introduced by hitchhiking on Viking longships only about a thousand years ago, are already much heavier than those on the mainland. — 2022