Weird Whirring

Today when I was on my lunch break while working at my grandparents' installing their floor, I heard a strange noise. It was a humming sort of noise. I thought maybe a swarm of bees was about to attack, or something bad was about to happen. It turned out to be two hummingbirds flying close by, that would explain the humming noise. They were fun to watch for the brief amount of time they were near before they zoomed away. They are impressive creatures.