Olive-capped Warbler

A medium-sized cuckoo of lowland and hill forest. Both sexes have a brown body, thick bill, and white stripe below the red eye. Male has distinctive black cap and black facial stripe. Feeds on fruit in the rainforest canopy. Similar to Long-billed Cuckoo, but Dwarf Koel has a shorter, thicker bill and white stripe on the face. Also from the larger female Pacific Koel by the smaller size and plain brown back. Call, a series of rising, single or double whistled notes.

Medium-sized open country flycatcher of Chaco woodland and flooded grasslands in N Argentina, W Paraguay, and SE Bolivia. Male from other Knipolegus by, in male, all dark wingsand grayish (as opposed to deep black) plumage. Female told from other female Knipolegus by dull, indistinct streaks on underparts, brown cap, rufous rump, and dull reddish iris. Prefers exposed perches in open thorn forest, roadsides, agricultural lands, and towns.

In typical woodcreeper fashion, this bird is mostly warm brown with streaks on the head and breast. Look for the notably long, extremely decurved bill. This species is easy to identify when it is the only scythebill in range, but in South America it overlaps with other scythebill species. Voice can be a good clue (Brown-billed usually stutters in its whistled series), and bill color can sometimes be helpful but often difficult to judge. Hitches up tree trunks much like a woodpecker. Most often seen following a mixed-species flock in the forest, sometimes in adjacent second growth.