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Taxonomic rank
- Species (551)
- Genus (398)
- Subspecies (376)
- breed (96)
- Family (94)
- species aggregate (27)
- Order (21)
- species hybrid (10)
- generic hybrid (3)
- Subspecies Aggregate (3)
- Form (2)
Taxon group
- bird (1,581)
Habitat
- terrestrial (463)
- marine (294)
- freshwater (200)