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Mr Flesher said he had been out to speak to some of the bird watchers and had met people from as far away as Glasgow.

However, the river channels are frequently used by runners, cyclists, bird watchers and others.

Southern California bird watchers saw a new and yet familiar sight in Orange County earlier this month.

A retired American diplomat, he is birding’s ultimate “big lister,” a star of the small but growing subculture of hypercompetitive bird watchers who scour the globe vying to see as many species as possible.

He was known for turning up unexpectedly at New Yorkers’ windows and was tracked around the Big Apple by bird watchers.