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The Humber Estuary is a site of special scientific interest and along with Bempton Cliffs Nature Reserve supports more than half a million birds annually including pink footed geese, puffins, avocets and bar-tailed godwits.

"When I noticed this Egyptian goose flying to this small island, I immediately focused on the avocet, knowing that it was going to charge in and see off the goose."

Along the way, we saw a multitude of birds — avocets, oystercatchers, white spoonbills and plenty of seagulls, in the air and expertly walking on the mud, leaving their tiny tracks.

The island hosts 2,200 breeding couples of common terns, 15 breeding pairs of the rarer little terns and 250 breeding pairs of avocets.

One day, Mariano saw “a Bonaparte’s gull mixed in with probably forty American avocets,” he said.