Buffleheads (sea ducks) were swimming just offshore.
Buffies migrate into the Chesapeake in winter, preferring to summer and nest further north. They are reputed to taste fishy, but a friend of mine who hunts them claims they make excellent jerky.
More pics after the jump:
horseshoe crab lies partially buried in the sand (they're not really a crab, but rather an arachnid, distantly related to spiders and scorpians). More often associated with New Jersey, where they come ashore in droves to mate and lay eggs. We have a decent population here in the Chesapeake, and in fall, particularly in September, many sheds wash up. You can tell a shed from a whole dead crab because they don't smell, and there is a split between the top and bottom at the front where the soft crab crawled out.