The Booted Racket-tail (Ocreatus underwoodii) is a species of hummingbird. It is found in the Andean cordillera of Bolivia, Colombia, Ecuador, Peru, and Venezuela; Venezuela also has a population on the northern coast. The upperparts are a golden green colour and the rump has a white bar. The throat and breast are a brilliant emerald green. The legs are feathered down to the feet with horny white short feasthers. The tail is brownish black and deeply forked. The tail feathers on either side increase in length from the centre and the outermost ones are exceptionally long and have bare shafts tipped by oval plumes, which gives the species its common name.