Very nice shots Mr. Scott. I am fortunate to have them here in Southern California, specifically at Bolsa Chica Wetlands. The sad part is that I have not been happy with my shots of them. That darned lack of length thingy is MAJORLY bugging me! I am just about to do something my wife may call crazy; like eating Top Ramen noodles for the rest of my life to make up for .......................!!!!
Well, there's no end to the quest for longer lenses. I have a 150-500 and it's frequently not long enough because I tend to shoot over a couple of different lakes a lot. If the critters are on the opposite side of the lake they could be in another state by the time I got over there.
The best thing to do when it's possible is get them to come to you. Throw out some seed or other food and they will come closer (if I do that at one of the lakes I frequent it's a $200 fine though). A zoo is also good for shots since the subjects are frequently very close. This little guy wasn't in a zoo but he wasn't going anywhere either so I could have gotten closer if I had another lens with me.