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Message: <blockquote data-quote="Firebird5" data-source="post: 3404365" data-attributes="member: 137983">It is a good question!I maintain a world life list, as well as WP, British and Lancashire lists. Like everyone else, it is ultimately my choice what I do and do not include in those lists. However, to aid comparison, I do follow AERC and BOU rules for my WP and British/Lancashire lists respectively. My general rule of thumb is that the population has to be self-sustaining or that the bird is a genuine vagrant; after all, such birds contribute to an area's avifauna. Hence, I've included birds such as Ring-necked Parakeet in my British list and, of course, tick the local Canada Geese. However, I wouldn't include an obviously escaped Bar-headed Goose or Egyptian Goose.Two tricky birds I've seen though are Ross's Goose at Marshside RSPB and Ruddy Shelduck in Hertfordshire, as both have the potential to be vagrants, but are generally considered to be escapees in a UK context.Cheers,Simon</blockquote>