Scarlet-thighed Dacnis (Dacnis venusta) - 24Nov2016

Per the Cornell website: "The adult male Scarlet-thighed Dacnis is unmistakable with a bright, turquoise-blue crown and nape, sides of head and neck, center of back, rump and scapulars. Its forehead, lores, sides of back, wings and tail, and mid-throat and belly are black; this is the only Dacnis that is black below. The thighs, for which this species gets its common name, are scarlet, but these are usually hidden."

True to the description, the scarlet thighs were hidden in the short glimpse I had at Arenal Observatory Lodge.