Here is a post from last year, but something worth repeating with the Ruby-throated hummingbirds soon to arrive throughout North America.
Across the US Pacific Coast, and very soon across most of North America, angry little hummingbirds will be assuming territories in many gardens. Males will be fighting for the rights to these breeding grounds spanning right across the country.
Imaged is an adult Male Ruby Throat, like you'd know from this distance, standing his ground. He chose about 5 different perches from one corner of our 3 acres to the other. He would sit for about 2-5 minutes on each perch watching over his territory, waiting for the females to arrive, and chasing out every other male that attempted a takeover. This was our well known "ZIGGY".
The dead branches on these towering trees are always perches for the Blackbirds and a few others that like to sit high up as they can. Ziggy would often times perch up there even when all the others were there. They wouldn't bother with him and he wouldn't bother with them. This is actually normal behavior for the adult male hummingbirds. They aren't trying to make themselves scarce. They actually want any approaching hummingbird to know that the king is there and he's not willing to tolerate any trespassers.
Please click on the image just so you believe me that it's a hummingbird. Even then you may not believe me!
May 2015, N.E. of Edmonton, Alberta.