Remains of a wartime carrier pigeon, above, were found in a
chimney in Surrey, England. Intelligence experts have found the
coded message it was delivering a challenge because of missing
information. SWNS  LONDON—Britain's world-renowned code-cracking
intelligence experts have admitted they've met their match—in a
dead pigeon.  The U.K's secretive communications intelligence
agency, known as GCHQ, issued a statement Friday acknowledging
it has been stumped by an encrypted message found attached to a
dead carrier pigeon believed to have been sent during World War
II.  The skeleton of the pigeon in question was found in the
chimney of a private home in Surrey, in southeast England. Tied
to its leg was a small red canister with a handwritten message
inside, under the heading "Pigeon Service."  The owner of the
home, David Martin, began searching for someone to help him
figure out the code—an effort that led him last month to the
curator of the pigeon exhibit at Bletchley Park, a country
estate some 80 miles to t