In high school twenty years ago, my IT class teacher told me that technically speaking, a collection of computer mice of different styles (that is, not all the same brand/shape/color/etc.) are actually called mouses, not mice. I always thought he was joking, but apparently it is/was considered correct at some point:

https://en.wikipedia.org/wiki/Computer_mouse#Etymology

Isn't it similar to fish vs fishes?

Multiple IT teachers (in different English schools) taught me that it was always mouses for computer mice. I don't know if they would be disappointed to learn I now often say mice, or if they do now too...