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Tumaco seedeater, Tumaco, Colombia
The moment our guide Manuel spotted this bird in his binoculars, he went into crazy excitement mode, pushing me around, pointing, and whispering "hurry hurry hurry". I was as always completely oblivious to what makes this an important observation.
From my notes, the Tumaco seedeater is is a hybrid species of the Chestnut-throated seedeater and the Ruddy-breasted seedeater. As the name suggests, the Tumaco seedeater hybrid concerns a tiny, isolated population.
The throat patch indicates this to be a male in the breeding season.

The chestnut-throated seedeater is Neotropical songbird in the family Thraupidae. It is found in along the western seaboard of South America, from southwestern Colombia to far northern Chile.