BATH, U.K. -- Scientists from the University of Bath have reported a dramatic fall in the number of grey whale sightings in British Columbia and are investigating the reasons for the disappearance of one of their main sources of prey.

The researchers, supported by international environmental charity Earthwatch, are studying grey whales in their summer feeding grounds off the west coast of Vancouver Island and the central coast of British Columbia to design better ways to protect them and determine whether populations are being affected by climate change.

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