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A common dolphin juvenile has been killed by four bottlenose dolphins in an attack that could become more common as the oceans warm, a cetacean expert has warned.
People on a dolphin spotting trip from New Quay, Ceredigion, were left "hysterical" by the incident on Thursday at 18:10 BST in Cardigan Bay, where the juvenile was thrown out of the water.
Climate change means common dolphin numbers are increasing in the area, where resident bottlenose dolphins will hunt them as a form of "play", said Matthew Westfield from the UK Cetacean Strandings Investigation Programme (CSIP).
It recovered the juvenile – estimated to be two years old – to perform an autopsy.