The Steely-vented Hummingbird belongs to the Amazilia genus, which contains a lot of similar hummingbird species like the Rufous-tailed and the Andean Emerald. They are all very similar in terms of body shape and size, but differ in their coloration and some of them in their habitat and behavior. It has a metallic green body with blue wings and tail, and shows yellow to magenta feathers on the rump. Their bill is thin and straight, and it has white feathers covering its legs. Like the Rufous-tailed, it is very aggressive and territorial.