Data source: Adam Scott Kennedy, Peter Boesman, Nigel J. Collar, and Lincoln D. C. Fishpool (2022) Geographical variation in the Bar-tailed Trogon Apaloderma vittatum. Bulletin of the British Ornithologists' Club 142:509-525 https://bioone.org/journals/bulletin-of-the-british-ornithologists-club/volume-142/issue-4/bboc.v142i4.2022.a10/Geographical-variation-in-the-Bar-tailed-Trogon-Apaloderma-vittatum/10.25226/bboc.v142i4.2022.a10.full