The '''booted racket-tails''',are a small group of [[hummingbird]]s in the genus '''''Ocreatus''''' that was long considered to have only one species, ''O. underwoodii'';. fieldField research by Karl-L. Schuchmann published in 2016, however, found notable differences between some populations traditionally assigned to ''O. underwoodii'', however, and recommended that the taxa ''annae'', ''addae'', and ''peruanus'' be raised to species level.<ref>{{cite journal | title=Biogeography and taxonomy of racket-tail hummingbirds (Aves: Trochilidae: Ocreatus): Evidence for species delimitation from morphology and display behavior | journal=Zootaxa | volume=4200 | issue=1 | pages=83 | doi= 10.11646/zootaxa.4200.1.3 | pmid=27988640 | url= https://www.researchgate.net/publication/311004563| year=2016 | last1=Schuchmann | first1=Karl-L. | last2=Weller | first2=André-A. | last3=Jürgens | first3=Dietmar }}</ref> The research results have been mostly accepted by the IOC[[International Ornithological Union]], with more data required for the species status of Anna's racket-tail.<ref>{{cite web | url=http://www.worldbirdnames.org/updates/proposed-splits/ | title=Proposed Splits/Lumps « IOC World Bird List}}</ref> TheT he [[American Ornithological Society]] has yet to recognize the split.
