>> one of my favorite hummingbird videos: <<

That is adorable.

On occasions when I've hung nectar feeders, I've had hummers eat while I was holding the feeder.

I love the videos of hummingbird swarms:

https://www.youtube.com/watch?v=OTGw0_nNVk4

https://www.youtube.com/watch?v=g4m8fGTMXHI

https://www.youtube.com/watch?v=hJsqFVT6Yiw

And here's the Sweety style of multiport feeder with birds all over it:

https://www.youtube.com/watch?v=oUkn-ABUzco

>>I can't find my other favorite, but it has a guy talking about how the birds can barely use their legs at all. They're atrophied in order to save weight. If I can find it, I'll put a link here.<<

Their sex organs shrink when not in use too.