Being reported as Baird's now by Birdguides.
A
"Now believed to be a Sanderling"
https://www.birdforum.net/showthread.php?t=361846
Think I'd agree, though tricky from these pics alone
Looks a little grey for an adult summer?
A
They often don't, when they're not chasing waves on a sandy beach!It didn't behave like a sanderling.
They often do, though not by as much as in Baird's; see e.g.:The photo also seems to show the primaries projecting beyond the tail which they do not in sanderling.