Mmmmm, don't think that's going to work!

What you need is some owl pellets (regurgitated undigestible bits which are spat out through the mouth as opposed to t'other end) and if you're
really lucky, and having dissected several dozen, you
might just have a mini-kit-of-parts from which you may be able to reassemble a vole-mouse creature with several heads and maybe a few other bony bits that haven't been dissolved by the bird's digestive processes.
Much easier, surely, to buy a mouse (as used for feeding pet snakes etc.) from a pet shop then boil it up Beatrix Potter-fashion until you are left with the skeleton. (Not that I've ever done that but I'm sure someone will be along soon to confirm it works!)

Or wait for your/your neighbour's moggy to deliver a dead mouse to your doormat/pillow....
(Doesn't work with sugar meece, however....

)