Spectacular footage of starlings captured by two British women canoeing on the River Shannon has become a viral internet hit.

In the last week, the two minute film entitled "Murmuration", has been viewed more than three million times on Vimeo.

A murmuration is a large, swirling, cloud-like formation consisting of thousands of starlings flying together.

It is typically seen at the onset of winter, just before dusk.

The film makers, Sophie Windsor Clive and Liberty Smith, describe it as "a chance encounter and shared moment with one of natures greatest and most fleeting phenomena."

Footage of another murmuration at Pallas Lake in Co Offaly was also captured on an iPhone last night by Mark Ryan.