This small bird has yellow underparts and yellowish-green upperparts. Males have a black facial mask, which females lack; their facial markings also differ.
The upperparts are yellowish-green, the underparts bright yellow, and the bill black. Males have a black face mask bordered by grey above. Females lack the mask and have greyish sides to the face, a yellowish eyering, and a yellowish stripe from bill to eye.
It lives among dense low vegetation in marshes and other wet places, feeding on insects and caterpillars. During breeding it builds a lined cup nest low in grass or rank vegetation.
An extinction-risk assessment has not been added yet.