Source: https://www.hbw.com/species/thick-billed-vireo-vireo-crassirostris
Timestamp: 2019-04-25 11:48:21+00:00

Document:
Probably closest to V. griseus, and has been treated as conspecific. Race approximans of V. pallens sometimes placed with present species, but is morphologically and vocally distinctive, and may represent a separate species. Five subspecies currently recognized.
V. c. crassirostris (H. Bryant, 1859) – Bahamas.
V. c. stalagmium Buden, 1985 – Caicos Is.
V. c. tortugae Richmond, 1917 – Tortuga I, off NW Hispaniola.
V. c. cubensis Kirkconnell & Garrido, 2000 – Cayo Paredón Grande, off N Cuba.
V. c. alleni Cory, 1886 – Cayman Is.
Woodland edge, bushes, scrubland; in Bahamas, xeromorphic habitats.
Food mostly insects and some berries. Forages by creeping along branches and twigs; very tame.
Brewer, D. (2019). Thick-billed Vireo (Vireo crassirostris). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/61242 on 25 April 2019).

References: V. 
 V. 

V. 

V. 

V. 

V. 

V.