Begin by having each child create a small animal out of dough. The animals must be able to fit inside the cups.
When the animals are complete, give each child a cup with gravel in the bottom and have them place their animals in their cups.
Using craft materials, have each child construct a shelter over their cup to protect the animal inside. Some materials may include construction paper and craft sticks.
When complete, place the cups in a sunny spot indoors for approximately one hour. Then, have the children compare their animals. The animals with the least protection will be squishy and soft. The ones with the most protection with be firmer.