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Faunal (Vertebrate) Biodiversity
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Species richness for the different classes of vertebrates in sikkim are:
| Groups | Species Richness | Comments |
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| Fish | 48 | 9 families, genera, many of commercial importance |
| Amphibians | 16 | preliminary checklist only |
| Reptiles | 26 | preliminary checklist only
| | Birds | 550 | 26 threatened (Birdlife International),9 of unknown distribution
| | Mammals | 144 | 39 rare or endangered(Schedule 1 Indian Wildlife Protection Act,1991).
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The butterfly species with known distributional ranges within sikkim belongs to five families. At present, 25 species of
butterflies of Sikkim Himalaya have been listed in the high conservation priority Schedule I of the indian Wildlife (Protection)
Act amended up to 1991 and another 300 species in Schedule II category.
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