Slaty-bellied Tesia or Warbler 
(Chích đuôi cụt, Tesia olivea)

The slaty-bellied tesia (Tesia olivea) is a species of warbler in the family Cettiidae.
The bird is found in Bangladesh, Bhutan, China, India, Laos, Myanmar, Nepal, Thailand, and Vietnam.

The genus Tesia is from the Nepalese word Tisi for the grey-bellied tesia.
olivea: Latin oliveus olive-coloured ( Latin oliva olive).