Often, bird guides don't show what you see in the field. For instance, a Green Sandpiper looks brown on paper but outside it's black and white when flying, totally different from the brown Wood Sandpiper.
Everything looks fragile and thin with a Marsh Sandpiper: the bill, the legs, the body. When I saw my first one it was with extreme backlight, couldn't see any color, still it was obvious, the silhouette says it all.