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Harpactes is a genus of birds in the family Trogonidae found in forests in South and Southeast Asia, extending into southernmost China.

1/ Red-headed trogon (Nuốc bụng đỏ, Harpactes erythrocephalus)
The epithet comes from the Ancient Greek terms eruthros meaning red, and kephale meaning head.
2/ Orange-breasted trogon (Nuốc bụng vàng, Harpactes oreskios)
3/ Ward's trogon (Nuốc đuôi hồng, Harpactes wardi)

Orange-breasted trogon 
(Nuốc bụng vàng, Harpactes oreskios)
The orange-breasted trogon (Harpactes oreskios) is a species of bird in the family Trogonidae.

The harpax or harpago (Koinē Greek: ἅρπαγα lit. "grabber, seizer, robber"; GEN ἅρπαγος harpagos)
(a Roman catapult-shot grapnel created by Marcus Vipsanius Agrippa for use against Sextus Pompey during the naval battles of the Sicilian revolt.)

Red-Headed Trogon 
(Nuốc bụng đỏ, Harpactes erythrocephalus)

The red-headed trogon (Harpactes erythrocephalus) is a species of bird in the family Trogonidae.

The epithet erythrocephalus comes from the Ancient Greek terms eruthros meaning red, and kephale meaning head.

Ward's trogon 
(Nuốc đuôi hồng, Harpactes wardi)

Ward's trogon (Harpactes wardi) is a species of bird in the family Trogonidae.
The bird is found in the northeastern parts of the Indian subcontinent stretching eastwards to Southeast Asia. It is found in Bhutan, India, Tibet, and Myanmar, no recent records in Vietnam.

The genus name Harpactes: The harpax or harpago (Koinē Greek: ἅρπαγα lit. "grabber, seizer, robber"; GEN ἅρπαγος harpagos)