Hi hutsitedigger.. i know this is going to sound really strange but I experienced exactly what you are talking about... i grew up right off brooke road about 2 miles from the aquia landing beach... On july 26th 2013 my boyfriend and I decided to jump over the park rail at nigh and head down to the beach (making that long walk from the gate in the dark) we hung out on the beach for about 1 hr and as we were walking back in the pitch black.. we were approached by and unseen. 'Animal' that made a deep growl/hissing sound at us... i went into a deep panic.. my boyfriend who is an avid duck hunter and marine made a noise back at this unknown creature ..The creature sounded big as it jumped back into the swamp... to this day we still talk about that night and wonder what it was that we encountered. . I still get chills when I think about it... i am 25 years old and like I said my boyfriend is a marine and duck hunter so we aren't some teenagers that would exaggerate something like this... In fact... i got so scared thinking back on this night that I decided to Google animals that live in the crows next hoping to find an answer or get closure. ..and stumbled upon this post.. it gave me chills and I created an account just so I could respond to you.. my boyfriend believes due to the sound it made.its movements. .etc.. that it isn't an animal if so.. not one that would live in this habit