It hovers, it hums - but it is not a hummingbird. Closer inspection would reveal a surprising lack of avian characteristics and you would be forced to re-assess the situation. With no legs or claws - and certainly no beak what you have here is a moth. No ordinary moth either - just take a look at that tongue.
In truth, it isn't actually a tongue. But if it isn't, what on earth is it? Take a look at one of, if not the most amazing, certainly the coolest insects on the planet - The Hummingbird Hawk Moth.