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Ocreatus underwoodii.

Ocreatus underwoodii is the only species in the genus Ocreatus, which has eight subspecies. It is distributed in South America (including Colombia, Venezuela, Guyana, Suriname, Ecuador, Peru, Bolivia, Paraguay, Brazil, Chile, Argentina, Uruguay and the Malvinas Islands (also known as the Falkland Islands). From different perspectives, we can see that the male dishtailed hummingbird’s feathers are shining and changing with magnificent metallic luster. Its feet have boot-like white fluff, and the two feathers of its tail can account for half of the total length.
Ps: There is no opportunity for us to see hummingbirds in the wild in China or even in Asia. The wild distribution of all hummingbirds (about 350 species are known at present) is confined to the American continent. If you see a small animal suspected of being a hummingbird in the wild in China, it depends on high-frequency flapping wings hovering in the air and stretching out its slender beak to suck nectar. Probably it’s some kind of long-beaked moth or perennial moth. If you also observe its brilliant metallic luster, it’s probably some kind of sunbird, and in some places it’s also called the fork-tailed Sunbird "Asian Hummingbird".
Sources: HBW Alive, Flickr, PBase, Universidad Icesi, Wikimedia Commons, pinterest, the naturefan

Finally, we recommend some enjoyable popular science video of hummingbird: "Earth: A Magical Day" Jackie Chan offered "Hummingbird vs. Bee".Web links(Recommended progress bar starting at 02:00)
Thumb-sized pantail hummingbirdThumb-sized pantail hummingbird!
Honeybees spin 360 degrees in the air to avoid enemies(01:04 Chinese subtitle translation errors, South Africa should be replaced by South America)
Sprouting spring

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