'''''Ocreatus''''' is a genus of hummingbird that was long considered to have only one species—thespecies, the [[booted racket-tail]]—buthas now four species''O. Fieldunderwoodii''; field research by Karl-L. Schuchmann published in 2016 determinedfound delimitationsnotable differences between thesome threepopulations traditionally assigned to ''O. underwoodii'', however, and recommended that the taxa (''anaeannae'', ''addae'', and ''peruanus'')andbe ''O.raised underwoodii''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 | doi= 10.11646/zootaxa.4200.1.3 | url= https://www.researchgate.net/publication/311004563_Biogeography_and_taxonomy_of_racket-tail_hummingbirds_Aves_Trochilidae_Ocreatus_Evidence_for_species_delimitation_from_morphology_and_display_behavior}}</ref> The research results have been mostly accepted by the IOC, with more data required for the species status of [[Anna's racket-tail]].<ref>[http://www.worldbirdnames.org/updates/proposed-splits/]</ref>
