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Click 4 Biology
Excellent site including very detailed notes, videos, quizzes, TOK - the lot! I can see that I have a lot of catching up to do! IB/IGCSE specific.
Photograph: Canadian Otter, Lontra canadensis, taken at the Oban Sealife Centre, Scotland. Unlike European otters, they are not nocturnal and will happily come out to play and entertain the visitors.