They belong to the Sciuridae family, which includes prairie dogs, chipmunks and marmots. There are more than 200 species of squirrels, according to the Integrated Taxonomic Information System (ITIS), and they are categorized into three types: tree squirrels, ground squirrels and flying squirrels.
Mix epoxy resin and pea gravel in a large bucket. For every 1.5 gallons of epoxy, add about 200 pounds of 1/4-inch gravel. This mixture covers about 50 square feet. Pour the epoxy and gravel mixture onto the floor and spread it out using a rake until the floor is between 3/8 and 1/4 inch thick. Trowel the surface flat.
Crushed rock or pea gravel work well at the bottom of a raised bed to improve drainage, particularly in beds more than 18 inches tall or where the bed is in an area of the yard with poor drainage. You can buy crushed rock and gravel from home improvement centers or rock yards.