After a long walk on the beach, my family and I enjoyed some wave jumping in the ocean. After relaxing in the sun, we headed out around noon. Only a few shorebirds made an appearance along the sandy shore. A Common or Mew Gull (Larus canus), above.
I've been told juvenile gulls have brown speckling like the bird above. But gulls get so big, it may be that interbreeding with dark plumaged birds has created a hybrid.
I believe these are White-rumped Sandpipers (Calidris fuscicollis). They look very similar to the picture accompanying the relevant article on Whatbird.com.