A mind always wanting to do new things for fun or learning. Opening the door is something they enjoy doing for fun or learning all of them take having fun or going new places very seriously so allowing them to have a safe place in the house does them a lot of good health-wise for exercise or general exercise they need to do to keep healthy No limit to what they can do more less so always be aware they can fit under most things or slide through things very fast and efficiently overall. Play them doing what they can do is a lot of fun plus makes them happy since they are very much social characters for most of the time which is a great experience short term or long term the whole playtime with them as such do it everyday of the week ferrets need you as much as you need them. https://www.funwithferrets.co.uk/2024/11/rat-tail-how-to-cure-it.html