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Helopsaltes is a genus of passerine birds in the grassbird family Locustellidae.

Pallas's grasshopper warbler (Helopsaltes certhiola), also known as the rusty-rumped warbler, is an Old World warbler in the grass warbler genus Helopsaltes, the family Locustellidae.

1/ Pallas's grasshopper warbler (Chích đầm lầy lớn, Helopsaltes certhiola)

2/ Pleske's grasshopper warbler (Helopsaltes pleskei), also known as Styan's grasshopper warbler and Taczanowski's warbler

Locustellidae, Locustella is from Latin and is a diminutive of locusta, "grasshopper".
The genus name Helopsaltes combines the Ancient Greek helos meaning "marshy ground" and psaltis "a chanter".

Pallas's grasshopper warbler 
also known as the rusty-rumped warbler
(Chích đầm lầy lớn, Helopsaltes certhiola)

Pallas's grasshopper warbler (Helopsaltes certhiola), also known as the rusty-rumped warbler, is an Old World warbler in the grass warbler genus Helopsaltes, the family Locustellidae.

The bird breeds in the eastern Palearctic: from the Altai Mountains, Mongolia and Transbaikalia to northeastern China, the Korean Peninsula, and islands in the Sea of Okhotsk (Sakhalin and Kuril Islands). It is migratory, wintering from India eastward to Indonesia.

Locustellidae, Locustella is from Latin and is a diminutive of locusta, "grasshopper".
The genus name Helopsaltes combines the Ancient Greek helos meaning "marshy ground" and psaltis "a chanter".
The specific certhiola is a diminutive from the genus Certhia, the treecreepers.

Pleske's grasshopper warbler 
(Helopsaltes pleskei), also known as Styan's grasshopper warbler and Taczanowski's warbler

Styan's grasshopper warbler (Helopsaltes pleskei), also known as Pleske's grasshopper warbler and Taczanowski's warbler, is a species of Old World warbler in the family Locustellidae. 
The bird breeds in eastern Siberia to Korea, Kyushu and Izu Islands; wintering in South China.

Locustellidae, Locustella is from Latin and is a diminutive of locusta, "grasshopper".
The genus name Helopsaltes combines the Ancient Greek helos meaning "marshy ground" and psaltis "a chanter".