Sentence:  One female , collected on an island off the coast of Nicaragua , was gravid and measured 4 feet 8 inches from snout to vent ( her <WSD>tail</WSD> should be between 6 and 7 inches long ) . 
Meaning of the word marked with <WSD> tags:  the posterior part of the body of a vertebrate especially when elongated and extending beyond the trunk or main part of the body