As for the groundhog, the tradition can be traced to early Christians in
Europe, when on Candlemas Day a hedgehog was said to look for his shadow: “If Candlemas Day be fair and bright, winter will have another flight. But if it be dark with clouds and rain, winter is gone and will not come again.”
Tape a large piece of paper to the wall. Place your object such as a stuffed animal with a good profile sideways next to the paper. (This is fun with people too!) Darken the room and shine the flashlight or shade-less lamp directing the profile shadowed onto the paper. Trace the shadow. Cut out the profile. Mount it on a contrasting piece of paper.
How to make a Priapic wand (Imbolc) for waking the flowers