The grass warblers (Grasshopper Warbler) are small passerine birds belonging to the genus Locustella, now considered the northernmost representatives of a largely Gondwanan family, the Locustellidae.

The genus name Locustella is from Latin and is a diminutive of locusta, "grasshopper".

1/ The lanceolated warbler (Chích đầm lầy nhỏ, Locustella lanceolata)
2/ Chinese Bush-Warbler (Chích ngực hung, Bradypterus tacsanowskius or Locustella tacsanowskia???)
3/ Brown bush warbler (Chích bụi rậm nâu, Locustella luteoventris )
Formerly placed in the "Old World warbler" assemblage as Bradypterus luteoventrus, it is now placed in the newly recognized family Locustellidae.

4/ Russet bush warbler (Chích nâu đỏ, Locustella mandelli)
The scientific name commemorates the Italian naturalist Louis Mandelli.