Almost got fooled on this one. At first, I thought this was a Baird’s Sandpiper. The body looks almost spot-on. However, the range map didn’t match. Also, the legs on this bird seemed to be yellower. Could be the way the light is falling on the bird.
However, a closer look at similar species led me to the Least Sandpiper.
Nikon D800, AF-S VR Nikkor 300mm f/2.8G IF-ED II, ISO 100, 300mm, f/5, 1/400s