14th July 2016 Bonaparte’s Gull Chroicocephalus philadelphia, as its scientific name testifies, is a North American species, and as ubiquitous as the similar black-headed gull Chroicocephalus ridibundus is here in Western Europe. A single Bonaparte’s turns up at Oare Marshes, and immediately the record is run out as an alert online; rarity is prized by many and, like many stormblown ‘Yankees’, the…