Justification of Red List Category
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
The population trend is decreasing in North America (based on BBS/CBC data: Butcher and Niven 2007).
Crotophaga sulcirostris occurs in the Americas, from the U.S.A. south through Mexico, Guatemala, Belize, El Salvador, Honduras, Nicaragua, Costa Rica and Panama to South America, where it occurs in Colombia, Ecuador, Peru, Chile, Venezuela, Guyana and the Netherlands Antilles (del Hoyo et al. 1997). The race pallidula, described from Cabo San Lucas in the early 20th century (Bangs and Pernard 1921), is probably now extinct.
Text account compilers
Butchart, S., Ekstrom, J., Khwaja, N.
BirdLife International (2019) Species factsheet: Crotophaga sulcirostris. Downloaded from http://www.birdlife.org on 17/11/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/11/2019.