I went out for a walk a couple weeks ago and paused at the top of the hill to enjoy the view when I saw a hummingbird zipping up high into the air and back down again, landing in the top branches of a small tree. Male Anna’s Hummingbirds display a similar sort of behaviour when attracting a mate; they zip up high into the sky and emit a very loud ‘Squeak!’ before zooming down and around in a great swoop and hovering in the air momentarily, their wings flapping so furiously they are a blur. Then they display their fabulously bright gorget at females to entice them (see photo below).
My hummer was showing this type of behaviour, and a couple of weeks ago in September, I watched two of them aggressively chasing one another around an apple tree. Its a bit early for mating behaviour (they mate as early as December), but I thought of another reason why they might be feeling extra-aggressive right now. Because, yes, small though they are, hummingbirds are aggressive, territorial birds. My theory? Here in Victoria, we have a good population of resident Anna’s Hummingbirds that stay here through the winter, but there are still some migratory birds among their number. I think our resident birds are defending their territories from the migratory population moving through.
And it is not only other hummingbirds that Anna’s Hummingbirds will move to boost from their area. The first thing I noticed about this little hummingbird was that he looked a little bit ragged. The second thing I noticed was how he zipped around madly each time another bird dared to land in his tree. He brazenly chased away a Hermit Thrush out of his tree soon after the unfortunate thrush decided to try landing there. He squeaked and zoomed and soon the thrush flew off to find a tree with a less noisy neighbour.
Not long after my hummer landed back on the top of his tree, presumably feeling quite satisfied and proud of his deeds, a Dark-eyed Junco dared to swoop in and pop a perch on the opposite side of the branches. It wasn’t long at all before the hummer chased him off, too, though he was a tad more stubborn than the thrush had been and eventually moved off to a nearby rock. Once more, my hummer was victorious, and he found a little bit of peace and quiet while no one else decided to invade his perfect tree. This just goes to show that the smallest birds can sometimes be the toughest, too.