Abstract: A composition of matter for repelling animals comprising the mixture of a metallic metal, a quantity of a soil that has been extracted from the earth, a nutrient source, and water. The soil is the type having a plurality of metallic metal metabolizing organisms thriving therein. The metallic metal is an ionic form of selenium. The nutrient source is a carbohydrate. In particular, the nutrient source can be lactose. The composition of matter further comprises a nitrogen source, such as tryptone. The composition may also include a quantity of tetrahydrofloate.