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exists and is an alternate of . The correct term is Guano. It is the feces and urine of seabirds, cave-dwelling bats, and seals. Guano manure is a highly effective fertilizer due to its high phosphorus and nitrogen content and its relative lack of odor compared to other forms of organic fertilizer such as horse manure.
The negative numbers under the bat size categories are the length to weight ratio. This means if you take the length of the bat you are searching for (e.g. 32 inches) and the size it comes in (e.g. -8), your bat would weigh 24 ounces. The length subtracted by the negative number will give the weight of the bat.