A few months ago we put up a hummingbird feeder in our front yard. It's located a few feet from our kitchen window. Shortly after putting it up, we began getting visitors. They're awesome to see but they come and go so quickly. One day, I happened to have my phone handy and already set to "slow motion" and captured this video.

Some interesting facts on Hummingbirds via Wikipedia:

With the exception of insects, hummingbirds while in flight have the highest metabolism of all animals, a necessity in order to support the rapid beating of their wings during hovering and fast forward flight.[3][16] Their heart rate can reach as high as 1,260 beats per minute, a rate once measured in a blue-throated hummingbird,[17] with a breathing rate of 250 breaths per minute, even at rest.[18] During flight, oxygen consumption per gram of muscle tissue in a hummingbird is approximately 10 times higher than that seen for elite human athletes.[3]

Hummingbirds consume more than their own weight in nectar each day, and to do so they must visit hundreds of flowers daily. Hummingbirds are continuously hours away from starving to death and are able to store just enough energy to survive overnight.[19]

Hummingbirds are rare among vertebrates in their ability to rapidly make use of ingested sugars to fuel energetically expensive hovering flight, powering up to 100% of their metabolic needs with the sugars they drink (in comparison, human athletes max out at around 30%). One study[20] showed that hummingbirds can use newly ingested sugars to fuel hovering flight within 30–45 minutes of consumption.[21] These data suggest that hummingbirds are able to oxidize sugar in flight muscles at rates high enough to satisfy their extreme metabolic demands. By relying on newly ingested sugars to fuel flight, hummingbirds can reserve their limited fat stores to sustain them overnight fasting or to power migratory flights.[20]

The dynamic range of metabolic rates in hummingbirds[22] requires a corresponding dynamic range in kidney function.[23] The glomerulus is a cluster of capillaries in each nephron of the kidney that removes certain substances from the blood, like a filtration mechanism. The rate at which blood is processed is called the glomerular filtration rate (GFR). Most often these fluids are reabsorbed by the kidneys. GFR also slows when a bird is undergoing water deprivation. The interruption of GFR is a survival and physiological mechanism unique to hummingbirds.[23]

Studies of hummingbirds' metabolisms are relevant to the question of how a migrating ruby-throated hummingbird can cross 800 km (500 mi) of the Gulf of Mexico on a nonstop flight.[18] This hummingbird, like other birds preparing to migrate, stores fat as a fuel reserve, thereby augmenting its weight by as much as 100% and hence increasing potential flying time over open water.