#MarineWildlife - Five dead whales have been found along Ireland's west coast and as BBC News reports, they may have been caused by naval sonar, an expert has said.

Dr Simon Berrow, of the Irish Whale and Dolphin Group (IWDG), said the Cuvier's beaked whales' deaths were "highly unusual".

Three of the whales washed ashore in Co. Donegal on 4 August while another was discovered 12 miles off shore.

A beaked whale was also discovered in Co. Mayo on the same day.

Dr Berrow said usually about three strandings of beaked whales were reported in Ireland every year.

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