26 dolphins died when they swam in the Percuil River, near Falmouth. For some reason they left the deeps waters and swam into the shallows where they were stranded. Only 7 were rescued.

The British Divers Marine Life Rescue suggests that a Navy ships' sonar may be responsible . It could have disorientated the dolphins which caused them to swim into the shallow water.

Dolphins' family-unity also may have played a role in this tragedy. If one dolphins becomes lost he calls others for help.

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