What ate my bathroom mat?!

[Nomad916]

Photo attached. Walked into bathroom this morning to see this. Top floor flat, no windows open overnight!

It looks like the rubber deteriorated

mice?

What's it made of? If there's any wool in it it could be grubs from moths, but I presume you'd have seen the grubs at some point either eating or in chrysalis as it's a bathroom mat right there for you to see. Silverfish eat carbohydrates eg cotton, if it's made of that and there's no rotten wood around to eat. I've never seen what something they ate looks like so I'm not sure. You could have an infestation and not know it though, they come out at night mostly and would live somewhere dark and damp like under the bathroom flooring. They breed like wildfire and it's said that if you see one, you've got a hundred unseen. They don't harm you so don't panic, just a nuisence. Or it could be mice. The disturbed rubber part definitely looks like the way mice chew things.

thats mouse damage.