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But great adventures come with their own challenges – where does a twitcher go to the toilet for instance?

One twitcher who made an early morning journey from London described catching a glimpse of the creature as "exhilarating".

The temporary twitcher had been walking his dog when he spotted the crowds and decided to join them, declaring that he would be "chuffed to bits" to see the American visitor.

Twitcher George Shannon said his "heart pounded" and he "couldn't believe it" when he saw it swoop past.

I am not a twitcher’s binocular strap, but I adore birds.