Geothlypis aequinoctialis
The Masked Yellowthroat is a small bird that is often seen foraging around the banks of streams or other water bodies.
It has bright yellow underparts with olive upperparts and a plumbeous crown. The male has a noticeable black mask over his eye.
The female has less contrast and is without the crown or mask but she has a white border around her eyes. The photo above is of a female