Yellowlegs at the Don Edwards refuge

This might just be another instance where I need your help figuring out which exact species the guys in the pictures are.

I took those photos a couple weeks ago at the Don Edwards San Francisco Bay Nation Wildlife Refuge and was able to identify those birds are Yellowlegs. The problem is there are two types of Yellowlegs -the Lesser Yellowlegs and the Greater Yellowlegs.

They are really similar. The only thing that seems to be different is the size, but I have no way of comparing them to their counterparts. Maybe you guys can help me with figuring this out.

Comments? They are much appreciated! ;)

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