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You have got me thinking Katherine and when you look at what Lincolnshire Listers have ticked there is some inconsistency with what you were told by the experts. So I went on the internet and this is what I found (beats watching Eastenders)
I still find it confusing so I will leave it to the experts to explain why most have Ruddy Shelduck on their list. It is classed as Category B I believe but when you look at the criteria you would have thought that it has been recorded apparently wild in Lincs/Britain since 1949
I am confused
The British List
BOU Species categories
In 1997 categorisation was revised to assist protection under national wildlife legislation, especially of naturalised species. Category C has been expanded to allow species with different histories to be distinguished; Category D has been reduced in scope, and a Category E (not included in this list) has been introduced to enable local and national recorders to monitor escaped species.
A Species that have been recorded in an apparently natural state at least once since 1 January 1950.
B Species that were recorded in an apparently natural state at least once between 1 January 1800 and 31 December 1949, but have not been recorded subsequently.
C Species that, although introduced, now derive from the resulting self-sustaining populations.
C1 Naturalized introduced species – species that have occurred only as a result of introduction, e.g. Egyptian Goose Alopochen aegyptiacus
C2 Naturalized established species - species with established populations resulting from introduction by Man, but which also occur in an apparently natural state, e.g. Greylag Goose Anser anser
C3 Naturalized re-established species - species with populations successfully re-established by Man in areas of former occurrence, e.g. Red Kite Milvus milvus
C4 Naturalized feral species - domesticated species with populations established in the wild, e.g. Rock Pigeon (Dove)/Feral Pigeon Columba livia .
C5 Vagrant naturalized species - species from established naturalized populations abroad, e.g. possibly some Ruddy Shelducks Tadorna ferruginea occurring in Britain. There are currently no species in category C5.
C6 Former naturalized species – species formerly placed in C1 whose naturalized populations are either no longer self-sustaining or are considered extinct, e.g. Lady Amherst's Pheasant Chrysolophus amherstiae .
D Species that would otherwise appear in Category A except that there is reasonable doubt that they have ever occurred in a natural state. Species placed in Category D only form no part of the British List, and are not included in the species totals.
E Species that have been recorded as introductions, human-assisted transportees or escapees from captivity, and whose breeding populations (if any) are thought not to be self-sustaining. Species in Category E that have bred in the wild in Britain are designated as E*. Category E species form no part of the British List (unless already included within Categories A, B or C).
F Records of bird species recorded before 1800.
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