The whale's corpse remains on the beach while a decision is made on removal. Rescuers have now left Castle Beach at Falmouth after a vet put the mammal down.
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More than 150 boats are taking part in the World Pilot Gig Championships - the biggest in its 27 year history.
A minute's applause will take place during the Army-Navy rugby match in memory of Captain David Seath, who died during the marathon.
RNLI lifeguards will start patrolling beaches in the region this weekend as the 2016 summer season get underway.