Green Warbler-Finch

The average size of green warbler-finches is 10 cm (3.9 in), and their weight can range from 8 to 10 grams (0.28 to 0.35 oz). Green warbler-finches have a greenish coloration to blend into their lusher semi-humid forest habitats, as well as distinctive reddish throat patches on breeding males. The upper half of the adult male is typically more sandy-brown, which differs from the female, as they have a more olive-brown upper half.

The green warbler-finch can use its sharp beak to gain access to different foods. Their diet consists mainly of seeds, insects, and small fruits. Some insects they eat include caterpillars, beetles, and ants, as well as spiders. They tend to eat more insects during the summer and more seeds, fruits, and berries during the winter months. The green warbler-finch tends to forage for food in small groups or alone. The green warbler-finch consists of only one subspecies, the nominate olivacea, from Santiago, Rábida, Pinzón, Isabela, Fernandina, and Santa Cruz. Its natural habitats are subtropical or tropical dry forests, subtropical or tropical moist montane forests, and subtropical or tropical dry shrubland. They are most typically found on larger islands, most abundant in places that are humid and have higher elevation, and less abundant at places with low elevation and dry.

The green warbler-finch exhibits monogamous behavior, often forming long-term bonds, and defends a small territory. It typically breeds during the hot wet season when bugs are plentiful. The male constructs a spherical nest using dry grasses, moss, and lichens, placing it on small branches. The female will then lay approximately 3 to 5 white eggs with reddish brown spots and incubate them alone for about 12 days. The young birds leave the nest only two weeks after hatching, contributing to the species' reproductive success.