Yellow-faced Grassquit (Tiaris olivaceus)

The Yellow-faced Grassquit is a seedeater found on grasslands. I have seen this species a few times at Fincas Bambuzal, Rio Frio where my parents live. The yellow face is diagnostic when trying to identify versus other seedeaters that may inhabit the same zone. They like to perch both on grass branches and in fence wires at the edge of trails and gravel roads; they will usually share space with Variable Seedeaters and Thick-billed Seed-Finches, although they are not confused easily with those species. Small juveniles take the risk to abandon the nest and call for their parents to feed them. It is very difficult to locate them in the tall grass.

Blue-black Grassquit (Volatina jacarina)

This is a very small and nervous bird. Taking a close up picture of this bird proved to be difficult, even during sunny days with great light available. The male in low light it looks black, but in sunlight it glows in a metallic blue color. The female is rather drab, sporting a brown look. The male perches in fence wire and posts, then suddenly starts jumping while making its call, doing acrobatic maneuvers in mid air, all to attract nearby females.