taxon_name searches all scientific names for a taxon, including not accepted ones. European Brown Bear has Ursus maritimus tyrannus as one unaccepted taxon name, so the search is matching on that. The best way to avoid these kinds of fuzzy matches is to query by taxon_id instead of taxon_name, so taxon_id=41644 instead of taxon_name=Ursus%20maritimus.
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