What are sum good DIY I can for my cats...?

😉 Bonjour, Hello

Put some boxes wisely placed in your house / apartment!.
Cats love them, they play hide and seek with us and / or the other cats, etc...

~~ Have a nice day ~~

Shelves for your cats to sit on, a feeding pole for them to climb to reach treats, cardboard box full of shredded paper for them to play in. This article has more suggestions;

http://www.catexpert.co.uk/cats/how-to-have-a-happy-indoor-cat/

DIY fortress home.

Are they good at maths, they could mark people's exams if they are