Sulphur-bellied Warbler
Phylloscopus griseolus
They were earlier also known by the name of olivaceous leaf-warbler. Like other leaf-warblers it gleans insects from small branches and leaves. They are found on rocky hill and scrub forest habitats.
The species is found in small groups and has a tendency to forage low in the vegetation sometimes even hopping on the ground. They have a single note cheep call.
Olivaceous Leaf Warbler