Yellowlegs!

Earlier, as I wandered the paths through the swamps that characterize the undeveloped parts of the Meadowlands, I disturbed this bird as it was tasting the delights on the mud right next to the path. Fortunately, it didn't fly too far away and I was able to get these shots:





The question is: is this a greater or lesser yellowlegs? I'm inclined to think it is a greater because of the white around its eyes and the white underbelly. But I'm so often wrong about these things that I once again seek input. How do you tell one from the other when they're not available for side-by-side comparison?