It's hilarious :-) they get so cross if we speak English with them rather than Swedish since they think we SHOULD be able to understand each other :-)

Thanks! It's pretty isn't it :-) Although Danish has gone in crazy directions. This video explains, accurately as far as I can determine from my semi-scholarly position: https://youtu.be/eI5DPt3Ge_s

At my house, mice don't injure themselves, that's the cat's job and he does it well

True, but I was responding to the general difficulty of small animals injuring themselves. I've buried many birds of all sizes over the years. Only one bird of prey - it left a tragically beautiful imprint on my window.

All the birds that have flown into windows and broken their necks would disagree.