We have a garden-variety 4-seater hummingbird feeder filled with sugar water solution in the backyard.
A couple of weeks ago, I spotted a distraught or annoyed hummer repeatedly hopping from his perch to peck at something hanging from the adjacent perch. Once I got my mind wrapped around what I was looking at, I realized that the "something" was another humming bird, hanging upside down from the perch, oblivious to what was going on.
My first thought was that it had somehow gotten its feet caught in the feeder, so I went out to see if there was anything to be done for it.
The other bird flew off as I approached, but the inverted bird didn't react at all; I figured it had died sometime during the day while hanging there.
I touched it lightly on the back and it opened one eye. When I stroked it a second time, it woke up, immediately flew into the side of the house, regained flight and disappeared into the neighbor's maple tree.
I've since seen this behavior several more times, and was finally able to get a couple of pictures. The one other time I approached the feeder when a bird was hanging, it flew away when I got within about 10 feet, so it wasn't "asleep" like the first one.
Just what are these birds up to when they're doing this?