Instructables has a DIY step-by-step tutorial on HOWTO make a duck-footed mouse. Here’s a taste:
Step 1 Obtain and dry duck feet
Find yourself some fresh duck feet. If you or your friends hunt or raise ducks, you’re all set. Otherwise you could visit your local asian grocery, butcher shop, or live poultry source and ask for the leftovers. These feet came from a green-winged teal I shot myself. I ate the rest.