weeeelll... *flicks through pages of memory*
1. They are the third smallest British breeding bird, after the firecrest and goldcrest.
2. (I think) they have the loudest song of any bird in comparison to their size - there are louder birds (eg in tropical forests) but weight-for-weight the wren sings loudest.
3. They are closely related to dippers.
Howzat?
