But many people there think they have seen one. 328 species and hundreds of subspecies are known till now and all scientific names used in this text comes from the Handbook of the Birds of the World - Volume 5 . One Hummingbird is more pretty than the other. If light comes perfect to plumage of a Hummingbird it often begins to glitter in different colors like a gem. Some species have special plume.
Most females are less brilliant but also very pretty.
Also the shapes of bills are varied. The difference of the bill shapes is for limitation of competition between the species. This bird family contains the smallest bird of the world. For this technique of flying they need a powerfull fuel - nectar. And that s the reason why we see them often hovering in the front of a flower.