Bird ID

I'm hoping that someone on the identify the following bird:

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This is a Yellowlegs - although it is hard to tell at this magnification if it is a lesser or greater, I am going to go with Greater Yellowlegs.

After looking further I think it might be the lesser. The description I have says that the greater tends to have a grayish base and a slight upturn to the bill while the lesser is always dark and straight. Yet, the call that it made seems to match the description of the greater as it was quite loud and piercing. But, then again, the description of the lesser just says it isn't as loud or piercing. If so, I'm not sure I'd want to hear the greater.

A little more scale to the image would help, especially to the bird's bill/head. From this shot I would say Lesser Yellowlegs, purely based on the length and lack of curve to the bill(a closer look would help confirm the latter). The Greater and Lesser have very similar calls so I wouldn't use that to differentiate.