Acorn Naturalists trademark ScatCast© replicas are custom arranged and cast from bird scat samples collected in the field by Acorn Naturalists. Our ScatCast© replicas show every detail found in the original specimen: each is custom cast using tough, natural-looking, non-toxic, flexible vinyl polymers that last for years. Our smaller ScatCast© replicas are arranged and mounted on same color vinyl pads. Larger ones are arranged for a realistic look when placed on trails (many naturalists use these replicas to "seed" trails and then discuss "who was here," predator/prey relationships, or food preferences). To keep ScatCast© replicas looking fresh, clean occasionally with any liquid soap.