There are five Thompson mice in the cathedral:
1. On the font cover
2. On the wooden doors at the west end of the south aisle (quite low down on the left).
3. On the wooden doors at the west end of the north aisle (quite high up on the left).
4. At the base of the wooden pedestal in the south east corner of the crossing.
5. On the clergy stall in the Lady Chapel. It was originally in the church of Llanddaniel Fab, now closed. It is sometimes moved to different positions in the cathedral.
There are Thompson mice at Holy Trinity, Llandudno and St Seiriol's Penmaenmawr (recently closed).