In addition to a marsh harrier and a kingfisher, the gulls were putting on a show on Lake Appert yesterday.
  A few of the gulls, with freshwater clams in their bills, would fly maybe 100 feet above the ice and drop the clams onto the ice.  The clams would open, at least some of the time, upon impact, and the gulls would eat the contents.
   How's that for openers?
   The bigger question is, where did the clams come from?
   Any thoughts? Please share them.
   Thanks.