costaricasparv Arremon costaricensis

Medium-sized sparrowlike bird with green back, gray eyebrow, black cheek, and white throat. Most similar to Black-striped Sparrow but with entire cheek black (not just eyeline); also compare with Chestnut-capped Brushfinch but note lack of rufous crown. Often found in pairs, usually scratching through leaf litter or low in a brushy tangle. Sexes alike.