Skomer and Skokholm 'puffin city's' big population drop
Thousands of puffins usually found on islands off Pembrokeshire are believed to have died following last winter's storms.
Researchers think the sea birds could not get enough fish to eat after prolonged gale force winds brought in huge Atlantic swells.
They estimate that 5,000 birds have died as a result, which is about 25% of the puffin colony mostly found on Skomer and Skokholm islands.
Breeding has also been affected.
Dr Matt Wood, lecturer of biology at the University of Gloucestershire, said the islands were like a "puffin city" and had taken a big hit that could have longer-term repercussions.
12 Dec 2014