Justification of Red List Category
Although this species may have a small range, it is not believed to 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). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size may be small, but it is not believed to 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 species is described as 'rare' (Stotz et al. 1996). Surveys in mangrove forests found the species at a density of 0.1 individuals/ha (Kendrick 2020). Assuming that the species occurs at this density across forested habitat within the entire range (330,000-460,000 ha; Global Forest Watch 2021, using Hansen et al.  data and methods disclosed therein), the population may number 3,300-4,600 individuals. This roughly equates to 2,200-3,000 mature individuals.
Despite hurricanes Irma and Maria causing major damage to forested habitat in Puerto Rico in 2017, the species does not appear to be negatively affected by the impacts: Surveys after the hurricanes found an increase in the rate of occupancy and the number of sites occupied (Lloyd et al. 2019). Precautionarily, the population is assessed as stable.
Text account compilers
Butchart, S. & Ekstrom, J.
BirdLife International (2022) Species factsheet: Coccyzus vieilloti. Downloaded from http://www.birdlife.org on 09/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 09/12/2022.