The sanderling and semipalmated sandpiper are two small, migratory shorebirds that are often confused with each other. Both species are found in North America, and they have similar plumage and behavior. However, there are a few key differences between the two birds.
The sanderling is slightly larger than the semipalmated sandpiper, and it has a longer, thinner bill. The sanderling’s legs are also longer and thinner than the semipalmated sandpiper’s legs. In flight, the sanderling’s wings are more pointed than the semipalmated sandpiper’s wings.