Two wild animal taxa are unique to St Kilda: the St Kilda Wren ("Troglodytes troglodytes hirtensis"), which is a subspecies of the Eurasian Wren, and a subspecies of Wood Mouse known as the St Kilda Field Mouse ("Apodemus sylvaticus hirtensis").
Two animal taxa are unique to St Kilda: a subspecies of Winter Wren ("Troglodytes troglodytes hirtensis") and a subspecies of Wood Mouse known as the St. Kilda Field Mouse ("Apodemus sylvaticus hirtensis").