Happy Holidays and some great tips from everyone.
I'm a little late with my reply but here goes. If you decide to put anything in your tail pipes be sure to tag them out with some hi-vis tape so you don't forget they are there. Second point, if you are concerned about critters in the pipes just wrap the ends with a light cloth and rubber bands around the pipes to keep the cloth in place. If you are storing your bike in a damp place rags in the pipes could retain moisture and will remain damp which is not good for your tailpipes. Personally, I don't put anything over the pipes. I want ventilation in there over winter.
Another option is to try spreading
critter ridder around the bike. That'll keep most animals away safely and definitely prevent bigger animals from marking their territory on your wheels and chrome.
My tip is to place a lawn chair and small table next to your bike so you can sit down with a cold drink and admire the bike when not riding it.