Eggshell is very good for squirrel strong bones and teeth because it is a natural and rich source of calcium carbonate, the primary building block for skeletal structure and teeth. Save your eggshells for calcium To provide sterilized eggshells for squirrels, follow these steps. Begin by washing the eggshells with water to remove any residue from the inside. Next, spread the cleaned shells in a single layer on a paper towel or baking sheet and let them air dry completely. Two alternative methods