Yellow-throated Euphonia (Ehphonia hirundinacea) - 25Nov2016 & 17Apr2019

Update 17Apr2019: Here is a marginally better photo from one in the Yucatan at Cenote Angelita.

Although this is not the only yellow-throated euphonia in Costa Rica, it is the only one in this area.  Photographed at Arenal Observatory Lodge.

Photobombed by a Shining Honeycreeper female and some Red-legged Honeycreeper females.