Worthen's Sparrow Spizella wortheni

Family: Passerellidae (New World sparrows)

Authority: Ridgway, 1884

Red List Category

Criteria: B1ab(i,ii,iii,v); C2a(i); D

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Justification of Red List category
This species has an extremely small and declining range and population, and fledging success is very low, but it qualifies as Endangered (rather than Critically Endangered) because it breeds at three sites and at least one subpopulation is larger than 50 mature individuals.

Population size: 100

Population trend: Decreasing

Extent of occurrence (breeding/resident): 1,300 km2

Country endemic: Yes

Land-mass type - continent
Realm - Nearctic
Realm - Neotropical
IUCN Ecosystem -- Terrestrial biome

Recommended citation
BirdLife International (2017) Species factsheet: Spizella wortheni. Downloaded from http://www.birdlife.org on 22/11/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/11/2017.