Well, that's not exactly true. Driftwood gets pushed up along the levees and the snakes can leave from there. Even though there are a lot of sugar cane fields, there still are some deep woods. The parishes along the river in S. LA support large populations of these integrades. It is amazing the variation that you see, i.e. saddles, red heads, checkered bellies, black bellies, white bellies, etc,etc. The slowinski cornsnakes from W. LA are clearly a relict population about midway in type between the emoryi to the West and the guttatus to the E. LA. has the greatest variation than any state except maybe TX.
LOVE THOSE NATURAL INTEGRADES !!
Jim