NATURAL HISTORY · CATALOGUE RECORD
Medium Ground Finch
Geospiza fortis Gould, 1837
Source-backed taxonomic record
Accepted species in Catalogue of Life’s 11 September 2026 base release. This preserves the source classification and available supporting data; it is not a completed species monograph.
Open encyclopedia reference
The medium ground finch (Geospiza fortis) is a species of bird in the family Thraupidae. It is endemic to the Galápagos Islands. Its primary natural habitat is tropical shrubland. One of Darwin's finches, the species was the first which scientists have observed evolving in real-time.
Many studies and research have been conducted on medium ground finches: there are the most famous studies conducted by Charles Darwin and more recent studies conducted in relation to the changes revolving around the medium ground finches due to natural selection. Due to an increase in urbanization on the Galápagos Islands, droughts and climate change, character displacement, changes in the finch's habitat and range, inbreeding and nesting, parasites, and viruses, medium ground finches have gone through changes. Changes that have been observed are beak size, behavior in feeding, behavior in inbreeding, behaviors in nesting, antibody development and more. The changes in the Galápagos Islands are factors that affect the medium ground finches.
Wikipedia contributors, Medium ground finch; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T08:17:35.393555+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Geospiza fortis Gould, 1837
- Name authority
- Gould, 1837
- Common name
- Medium Ground Finch
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Aves
- Order
- Passeriformes
- Family
- Thraupidae
- Genus
- Geospiza
- Extinction status
- Recorded extant
Classification family tree
Nested taxonomic groups from the source. This is not a direct-ancestor chain, a dated evolutionary tree or a phylogenetic reconstruction.
- domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
- kingdomAnimalia
- phylumChordata
- subphylumVertebrata
- infraphylumGnathostomata
- parvphylumOsteichthyes
- megaclassTetrapoda
- classAves
- orderPasseriformes
- familyThraupidae
- genusGeospiza Gould, 1837
- speciesGeospiza fortis Gould, 1837
Close classified relatives
These entries share the source’s genus, Geospiza. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Espanola Cactus FinchGeospiza conirostris Ridgway, 1890 | ThraupidaeChordata | Accepted speciesRecorded extant |
| Large Ground FinchGeospiza magnirostris Gould, 1837 | ThraupidaeChordata | Accepted speciesRecorded extant |
| Genovesa Ground FinchGeospiza acutirostris Ridgway, 1894 | ThraupidaeChordata | Accepted speciesRecorded extant |
| Sharp-beaked Ground FinchGeospiza difficilis Sharpe, 1888 | ThraupidaeChordata | Accepted speciesRecorded extant |
| Small Ground FinchGeospiza fuliginosa Gould, 1837 | ThraupidaeChordata | Accepted speciesRecorded extant |
| Genovesa Cactus FinchGeospiza propinqua Ridgway, 1894 | ThraupidaeChordata | Accepted speciesRecorded extant |
| Common Cactus FinchGeospiza scandens (Gould, 1837) | ThraupidaeChordata | Accepted speciesRecorded extant |
| Vampire Ground FinchGeospiza septentrionalis Rothschild & E. Hartert, 1899 | ThraupidaeChordata | Accepted speciesRecorded extant |
Documented distribution
Source distribution statements, not a complete range map. A listed locality is not necessarily a place of origin.
Source literature & publication evidence
References attached to this source record, including nomenclatural citations where supplied. This is a selected bibliography; abbreviated citations remain in the source’s form.
- https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=560237 Source fields: Taxon.tsv dwc:namePublishedIn, Taxon.tsv dcterms:references
Origins, evidence & remaining research
Name authority and publication references document nomenclature where the source supplies it. They do not establish evolutionary origins or the earliest fossil occurrence.
Specimen-level evidence, morphology, ecological research, phylogenetic studies, a comprehensive bibliography and a located literary passage have not yet been compiled for this record. A suitable sourced image remains to be added.
Dataset citation & attribution
This exact taxon in ChecklistBank · Catalogue of Life 2026-09-11
Catalogue of Life 2026-09-11; dataset 316321; doi:10.48580/dgz5n. https://creativecommons.org/licenses/by/4.0/ . Retrieved 5 October 2026.
Stable key: col:3FSBZ. Classification follows source parent identifiers. English common names may vary by region.