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Message: <blockquote data-quote="kb57" data-source="post: 3594375" data-attributes="member: 133932">What seems to be a grey area is with what we in UK term 'Category C' species, i.e. self-sustaining populations derived from introductions, in circumstances where these may be supplemented by additional escapes or recent introductions which are not self-sustaining.I'm thinking in particular of the Egyptian geese and Mandarins I saw in Kensington Gardens at the weekend, along with little owl and ring-necked parakeet.  The owl and parakeet - no problem, but the waterfowl bothered me, with the presence of collections in nearby parks meaning they could be recent escapes.  I've erred on the side of caution and not added them to my year list.Similarly, I didn't count the lammergeier which I saw in the French Alps earlier this year - the points made earlier in the thread about generation time I think are still valid here.  But I did enjoy seeing it!  I would suggest the east of Scotland white-tailed eagle population from the more recent Fife introductions is in a similar position.Of course it is valid and indeed important to record the presence of introductions and escapes, whether deliberate conservation schemes or potentially invasive species.  I remember in my youth we used to ignore feral pigeons whilst happily ticking pheasants, which isn't at all logical!</blockquote>