Medium Tree-finch Geospiza pauper

Family: Thraupidae (Tanagers)

Authority: (Ridgway, 1890)

Red List Category

Criteria: B1ab(v)

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Justification of Red List category
This species qualifies as Critically Endangered as it has a very small range on a single island, and recent information suggests that it is declining rapidly owing to the effects of the dipterid parasite Philornis downsi.

Population size: 600-1700

Population trend: Decreasing

Extent of occurrence (breeding/resident): 30 km2

Country endemic: Yes

Land-mass type - oceanic island
Realm - Neotropical
IUCN Ecosystem -- Terrestrial biome

Recommended citation
BirdLife International (2022) Species factsheet: Geospiza pauper. Downloaded from on 25/01/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from on 25/01/2022.