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Gary Allport from Birdlife International said it was "amazing" to see the gull, which is normally a "coastal species".

Mr Allport travelled from the Midlands to Grafham Water on Tuesday to see the gull.

Allport, 43, of Pennal Grove, Ingleby Barwick, admitted causing death by careless driving and was jailed for five years and seven months.

Amie Linton died after Simon Allport's BMW crashed into her car in Stokesley, North Yorkshire, in July 2020.

Allport’s idea, though incorrect, was attributed back to Darwin and eagerly adopted by like-minded scientists.