This looks like a female golden-browed chlorophonia, which is a member of the tanager family. A male golden-browed chlorophonia differs from because it has a yellow streak on his forehead and over his eye, and his coloration is a little brighter.
Tanagers are native to the Western Hemisphere. There are 230 different species of tanagers. They will flock with other birds and will inhabit areas close to man. They particularly like fruit trees.
Costa Rica is home to more species of birds than the USA and Canada combined, so I feel fortunate when I can find a bird with which I was not familiar in a guidebook in order to share the information for this website. I confess that I was not familiar with the name of golden-browed chlorophonias until I looked up this bird photo.
This week we are showing nighttime photos of Budapest on Viva la Voyage.