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Last Updated: Tuesday July 28 2009 14:35 GMT

'Big cat' filmed on the prowl

Check out this mobile phone video of what appears to be a big cat walking along a railway line in Argyll, Scotland.

It was filmed by an off-duty dog handler who said he thought it was a labrador dog at first, but after a closer look realised it couldn't be.

Experts say it's definitely not a domestic cat and reckon it could be about a metre long.