Saturday, October 27th 2012, 6:16 PM EDT
Fisherman first noted the phenomena this week as they saw skies full of common garden birds falling into the sea about their boats.
The Royal Society for the Protection of Birds said they had received several reports from all along the British south coast of thousands of disorientated and exhausted birds drowning in the sea.
“The scale of these reports is truly shocking and it has the potential to adversely affect the status of species which may be declining for other reasons,” RSPB’s conservation director Martin Harper said.
One fisherman said the species including robins, blackbirds and thrushes fell as they tried to make shore.
“While fishing about 10 miles south of Portsmouth, we witnessed thousands of garden birds disorientated, land on the sea and most drowning. The sky was thick with garden birds. I estimate I saw 500 birds die and that was just in our 300-yard sphere.”
The RSPB said when the birds left Scandinavia it was “glorious sunshine” but then a heavy fog and icy rain swept across the North Sea. Many birds had made it to England before heading to warmer climes in southern Europe.
Temperatures across the UK was barely zero overnight in most parts with snow falling in parts of Scotland.