Although larger ones have purportedly been seen in the wild, https://www.youtube.com/watch?v=wKc3EcAQQSQ World's Largest Cottonmouth Snake – Mossy Oak according to Gloyd and Conant (1990), the largest recorded specimen of A. p. piscivorus was 188 cms in total length, Conant, 1975 based on a specimen caught in the Dismal Swamp region and given to the Philadelphia Zoological Garden.