Certhidea olivacea
The Green Warbler-Finch (Certhidea olivacea) is a captivating member of Darwin's Finches, renowned for its warbler-like appearance and behavior, a stark contrast to the more robust-billed finches of the Galápagos. This small passerine typically measures 10-11 cm in length and weighs about 8-10 grams. Its plumage is primarily olive-green on the upperparts, with paler, yellowish underparts, and a relatively slender, pointed bill, distinguishing it readily from its finch relatives like the groun...
Predominantly found in humid highland forests, shrubland, and dense vegetation zones, particularly areas dominated by *Scalesia* or *Miconia* trees. It typically inhabits elevations above 200 meters, preferring cooler, wetter environments.
Primarily insectivorous, feeding on a wide variety of small insects and other arthropods, including caterpillars, spiders, beetles, and flies. It supplements its diet with small amounts of nectar and fruit, obtained by gleaning from foliage or flowers.
The Green Warbler-Finch is an extremely active and agile bird, constantly flitting through foliage and branches in search of prey, often in the mid-canopy to sub-canopy layers. Its foraging strategy is distinctly warbler-like, involving gleaning insects from leaves, twigs, and bark, and occasiona...
The Green Warbler-Finch is endemic to the central and western islands of the Galápagos Archipelago, a distribution that significantly overlaps with its former conspecific, the Grey Warbler-Finch. Its breeding range encompasses islands such as Santa Cruz, Isabela, Fernandina, Santiago, Pinzón, and...
Least Concern
- The Green Warbler-Finch was instrumental in Charles Darwin's formulation of the theory of evolution by natural selection, though he initially misidentified it. - Unlike most of Darwin's Finches which have stout, conical bills for crushing seeds, the Green Warbler-Finch possesses a slender, poin...