The Thick-billed Seed-Finch is pretty abundant in Fincas Bambuzal, Rio Frio. They can be found all around the grass and forest edge, feeding on grass seeds primarily, but also on seeds from flowering plants. The male is black with a barely visible white patch on the wings, while the female is brown in coloration.

This female was busy grabbing grass seeds to feed her young

Small grass twigs can actually support the weight of an adult bird, though normally it does move a lot after landing