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| 1. BirdLife International - Taxonomy
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| BirdLife International maintains its own taxonomic list of all the world's bird species because there are so many different global, regional, national, site and family taxonomic checklists, and so many differences of opinion over the taxonomic rank of certain taxa. Find out all about Birdlife in this official website. |
| http://www.birdlife.org/datazone/species/taxonomy.html |
| 2. HORTAX - The Horticultural Taxonomy Group
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| A small committee of plant taxonomists and horticulturists based in the British Isles and having a professional interest in the classification and nomenclature of cultivated plants. |
| http://www.hortax.org.uk/ |
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