I noticed a Gull acting strange the other day. He flew a few feet up in the air, then dove straight down. I assumed he was catching fish, but I watched and realized, never a fish. Just jumping up and down.
I had a long lens and zoomed in. Well, the bird had perfect form. Every dive he positioned his legs like a high diver.
The photos here are the clearest, but he did this same position over and over. He finally stopped and floated around looking pleased with himself.
Now, the next time I see a gull diving I need to catch the action again. I never paid attention but I bet they all do it.