I live close to a very large creek here called Paint creek and being raised here in the next county I never was able to get close enough with a shotgun until I learned to hide, where you expect them to be, I watched and waited until he paddled up to within 5 or 6 feet of the shore and started shooting, he heard my Nikon d2x click away" its much louder than my d100 but its very fast" I usually wait one hour if they don't show I move on up or down the creek . Once about a month ago I had a flock of nearly 100 land close to me but too much brush to get any good shots.
Go to Bass pro shop and buy their one man outhouse tent only cost about $120.00 if memory serves me it makes a wonderful portable lightweight tent , with enough room for you and a seat and your tripod which is a must. You'll have birds to close to focus . Back yard shot .
Hope this helps Morris: any way I can help I will .
Thanks Randall