At low tide, the hidden contours of the marsh emerge. Instead of birds floating gracefully on water, I saw these birds with legs and beaks caked in mud looking for food.

Nikon D800, Nikkor AF-S 28-300mm f/3.5-5.6G ED VR, ISO 100, 300mm, f/5.6, 1/320s
Hi! I believe those birds are black-tailed-godwits (Limosa limosa)! Nice shot!
Thanks Liliana.