Worthen's Sparrow Spizella wortheni

Search terms 

Red List Category

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

Click here for more information about the Red List categories and criteria

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 mature individuals

Population trend: Decreasing

Distribution size (breeding/resident): 25 km2

Country endemic: Yes

Land-mass type - continent - Continents are land masses > bigger than Australia (=7,682,300 sq km).
Realm - Nearctic - realm
Realm - Neotropical - realm
IUCN Ecosystem -- Terrestrial biome

Recommended citation
BirdLife International (2016) Species factsheet: Spizella wortheni. Downloaded from http://www.birdlife.org on 04/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 04/12/2016.