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according to my information its still called Larus tridactyla
Linnaeus apparently classified it as Larus tridactylus, but it seems to have changed to Rissa with Stephens in the 1820s, as far as I can glean from a few websites. I have never seen it as Larus before...I wonder which book you are using for that?
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I’ve checked in my guides (they range from a 1949 edition of Collins to the latest 2009 edition via a first edition Observer’s book of Birds) and several websites. They all have the Kittiwake as Rissa tridactyla, the BTO also refers to it as this (http://blx1.bto.org/birdfacts/results/bob6020.htm).
Lat/Lng: 54.1, -0.2
OS grid ref: TA1973