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Pachyglossa is one of the three genera of flowerpeckers that make up the family Dicaeidae. 
These bird species are found in montane areas of South and Southeast Asia.
The genus Pachyglossa was resurrected to solve the paraphyly because the genus Pachyglossa was paraphyletic with respect to the genus Prionochilus.

1/ Thick-billed flowerpecker (Pachyglossa agilis) 
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2/ Yellow-vented flowerpecker (Pachyglossa chrysorrhea)
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3/ Yellow-bellied flowerpecker (Pachyglossa melanozantha)
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The genus name Pachyglossa combines the Ancient Greek παχυς/pakhus meaning "thick" with γλωσσα/glōssa meaning "tongue", "mouth" (or "bill").

Thick-billed flowerpecker (Pachyglossa agilis) 
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Thick-billed flowerpecker (Pachyglossa agilis)  is a tiny bird in the flowerpecker family Dicaeidae.

Dicaeidae, Dicaeum: Greek dikaion supposedly an Indian bird mentioned by Aelianus.
The genus name Pachyglossa combines the Ancient Greek παχυς/pakhus meaning "thick" with γλωσσα/glōssa meaning "tongue", "mouth" (or "bill").
agile, agilis: Latin agilis nimble, active.

Yellow-bellied flowerpecker 
(Pachyglossa melanozantha)
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The yellow-bellied flowerpecker (Pachyglossa melanozantha) is a species of bird in the flowerpecker family Dicaeidae.
The bird is found in Bangladesh, Bhutan, China, India, Laos, Myanmar, Nepal, Thailand, and Vietnam.

The name Dicaeidae is from the Ancient Greek dikaion. Cuvier claimed that this was a word for a very small Indian bird.
The genus name Pachyglossa combines the Ancient Greek παχυς/pakhus meaning "thick" with γλωσσα/glōssa meaning "tongue", "mouth" (or "bill").
melanozantha: Greek melas black; xanthos yellow.

Yellow-vented flowerpecker (Pachyglossa chrysorrhea)
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The yellow-vented flowerpecker (Pachyglossa chrysorrhea) is a species of bird in the family flowerpecker Dicaeidae.

Dicaeidae: Greek dikaion supposedly an Indian bird mentioned by Aelianus.
The genus name Pachyglossa combines the Ancient Greek παχυς/pakhus meaning "thick" with γλωσσα/glōssa meaning "tongue", "mouth" (or "bill").
chrysorrheum, chrysorrhoa, chrysorrhea: Greek khrusos gold; orrhos rump.