English common name: Gray Warbler Finch
Spanish common name: Pinzón cantor gris
Taxonomic comments: This species is closely related to the Green Warbler Finch, and were formerly considered conspecific, but both species differed in appearance, distribution, habitat, and song. Syn.: Certhidea olivacea Gould, 1837.
A recent genetic study has shown a single colonization event about 850 000 yrs ago from southern central America rather than continental Ecuador.
Name status: Accepted name; taxon occurs in Galapagos.
Description: The smallest of all Darwin finches, about 8 grams, and the species with the thinnest beak.
As for other finches, threats are probably now mainly introduced diseases.
Last updated: 28 Aug 2017
Taxon occurs only in Galapagos.
Not Evaluated - Not yet been evaluated against the criteria.
The IUCN Red List assessments presented here may deviate from the global IUCN listings for the following reasons:
C. fusca is found on the smaller islands in the north, east and south of the archipelago, practically spanning the entire length of the archipelago. Present on Darwin, Wolf, Española, Santa Fe, San Cristobal, Pinta, Floreana.
Preference for altitude zone in Galapagos: Dry zone-transition zone.
Habitat preferences: Found in drier habitats than C. olivacea, but also at moderate to high elevation on San Cristóbal.
Substrate or host preferences: Forages in trees and shrubs, searching foliage leaf clusters and epiphytes and probing mosses (especially during the dry season), for arthropods.
Trophic role: Carnivorous (feeding on animals).
Feeding type: Insectivorous (feeding on insects).
Reproductive biology: Male displays in front of a dome shape nest. Once chosen, the pair either use this nest or build a new one. Only females incubate (two to three eggs), both feed the chicks. Fledglings stay for up to 6 weeks with a parent, either with the male while the female starts a new clutch, or, one with the female and the other with the male.